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  <link:roleRef roleURI="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="simple" xlink:href="http://www.xbrl.org/lrr/role/negated-2009-12-16.xsd#negatedLabel"/>
  <link:roleRef roleURI="http://www.xbrl.org/2009/role/negatedTotalLabel" xlink:type="simple" xlink:href="http://www.xbrl.org/lrr/role/negated-2009-12-16.xsd#negatedTotalLabel"/>
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    <link:label id="lab_ck0001710607_AuthorizedParticipantConcentrationRiskMember_label_en-US" xlink:label="lab_ck0001710607_AuthorizedParticipantConcentrationRiskMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Authorized Participant Concentration Risk Member</link:label>
    <link:label id="lab_ck0001710607_AuthorizedParticipantConcentrationRiskMember_documentation_en-US" xlink:label="lab_ck0001710607_AuthorizedParticipantConcentrationRiskMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Authorized Participant Concentration Risk Member</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ck0001710607_AuthorizedParticipantConcentrationRiskMember" xlink:href="ck0001710607-20260914.xsd#ck0001710607_AuthorizedParticipantConcentrationRiskMember"/>
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    <link:label id="lab_ck0001710607_ActiveManagementRiskMember_label_en-US" xlink:label="lab_ck0001710607_ActiveManagementRiskMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Active Management Risk Member</link:label>
    <link:label id="lab_ck0001710607_ActiveManagementRiskMember_documentation_en-US" xlink:label="lab_ck0001710607_ActiveManagementRiskMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Active Management Risk Member</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ck0001710607_ActiveManagementRiskMember" xlink:href="ck0001710607-20260914.xsd#ck0001710607_ActiveManagementRiskMember"/>
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    <link:label id="lab_ck0001710607_RedemptionRiskMember_documentation_en-US" xlink:label="lab_ck0001710607_RedemptionRiskMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Redemption Risk Member</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ck0001710607_RedemptionRiskMember" xlink:href="ck0001710607-20260914.xsd#ck0001710607_RedemptionRiskMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ck0001710607_RedemptionRiskMember" xlink:to="lab_ck0001710607_RedemptionRiskMember" xlink:type="arc" order="1"/>
    <link:label id="lab_ck0001710607_PriceVolatilityRiskMember_label_en-US" xlink:label="lab_ck0001710607_PriceVolatilityRiskMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Price Volatility Risk Member</link:label>
    <link:label id="lab_ck0001710607_PriceVolatilityRiskMember_documentation_en-US" xlink:label="lab_ck0001710607_PriceVolatilityRiskMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Price Volatility Risk Member</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ck0001710607_PriceVolatilityRiskMember" xlink:href="ck0001710607-20260914.xsd#ck0001710607_PriceVolatilityRiskMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ck0001710607_PriceVolatilityRiskMember" xlink:to="lab_ck0001710607_PriceVolatilityRiskMember" xlink:type="arc" order="1"/>
    <link:label id="lab_ck0001710607_FrontierEmergingMarketsRiskMember_label_en-US" xlink:label="lab_ck0001710607_FrontierEmergingMarketsRiskMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Frontier Emerging Markets Risk Member</link:label>
    <link:label id="lab_ck0001710607_FrontierEmergingMarketsRiskMember_documentation_en-US" xlink:label="lab_ck0001710607_FrontierEmergingMarketsRiskMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Frontier Emerging Markets Risk Member</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ck0001710607_FrontierEmergingMarketsRiskMember" xlink:href="ck0001710607-20260914.xsd#ck0001710607_FrontierEmergingMarketsRiskMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ck0001710607_FrontierEmergingMarketsRiskMember" xlink:to="lab_ck0001710607_FrontierEmergingMarketsRiskMember" xlink:type="arc" order="1"/>
    <link:label id="lab_ck0001710607_GreaterChinaRiskMember_label_en-US" xlink:label="lab_ck0001710607_GreaterChinaRiskMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Greater China Risk Member</link:label>
    <link:label id="lab_ck0001710607_GreaterChinaRiskMember_documentation_en-US" xlink:label="lab_ck0001710607_GreaterChinaRiskMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Greater China Risk Member</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ck0001710607_GreaterChinaRiskMember" xlink:href="ck0001710607-20260914.xsd#ck0001710607_GreaterChinaRiskMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ck0001710607_GreaterChinaRiskMember" xlink:to="lab_ck0001710607_GreaterChinaRiskMember" xlink:type="arc" order="1"/>
    <link:label id="lab_ck0001710607_StyleRiskMember_label_en-US" xlink:label="lab_ck0001710607_StyleRiskMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Style Risk Member</link:label>
    <link:label id="lab_ck0001710607_StyleRiskMember_documentation_en-US" xlink:label="lab_ck0001710607_StyleRiskMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Style Risk Member</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ck0001710607_StyleRiskMember" xlink:href="ck0001710607-20260914.xsd#ck0001710607_StyleRiskMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ck0001710607_StyleRiskMember" xlink:to="lab_ck0001710607_StyleRiskMember" xlink:type="arc" order="1"/>
    <link:label id="lab_ck0001710607_GrowthStocksRiskMember_label_en-US" xlink:label="lab_ck0001710607_GrowthStocksRiskMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Growth Stocks&#160;Risk Member</link:label>
    <link:label id="lab_ck0001710607_GrowthStocksRiskMember_documentation_en-US" xlink:label="lab_ck0001710607_GrowthStocksRiskMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Growth Stocks&#160;Risk Member</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ck0001710607_GrowthStocksRiskMember" xlink:href="ck0001710607-20260914.xsd#ck0001710607_GrowthStocksRiskMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ck0001710607_GrowthStocksRiskMember" xlink:to="lab_ck0001710607_GrowthStocksRiskMember" xlink:type="arc" order="1"/>
    <link:label id="lab_ck0001710607_AmericanCenturyETFTrustMember_label_en-US" xlink:label="lab_ck0001710607_AmericanCenturyETFTrustMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">American Century ETF Trust</link:label>
    <link:label id="lab_ck0001710607_AmericanCenturyETFTrustMember_documentation_en-US" xlink:label="lab_ck0001710607_AmericanCenturyETFTrustMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">American Century ETF Trust</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ck0001710607_AmericanCenturyETFTrustMember" xlink:href="ck0001710607-20260914.xsd#ck0001710607_AmericanCenturyETFTrustMember"/>
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    <link:label id="lab_ck0001710607_SectorRiskMember_label_en-US" xlink:label="lab_ck0001710607_SectorRiskMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Sector Risk Member</link:label>
    <link:label id="lab_ck0001710607_SectorRiskMember_documentation_en-US" xlink:label="lab_ck0001710607_SectorRiskMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Sector Risk Member</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ck0001710607_SectorRiskMember" xlink:href="ck0001710607-20260914.xsd#ck0001710607_SectorRiskMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ck0001710607_SectorRiskMember" xlink:to="lab_ck0001710607_SectorRiskMember" xlink:type="arc" order="1"/>
    <link:label id="lab_ck0001710607_CurrencyRiskMember_label_en-US" xlink:label="lab_ck0001710607_CurrencyRiskMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Currency Risk Member</link:label>
    <link:label id="lab_ck0001710607_CurrencyRiskMember_documentation_en-US" xlink:label="lab_ck0001710607_CurrencyRiskMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Currency Risk Member</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ck0001710607_CurrencyRiskMember" xlink:href="ck0001710607-20260914.xsd#ck0001710607_CurrencyRiskMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ck0001710607_CurrencyRiskMember" xlink:to="lab_ck0001710607_CurrencyRiskMember" xlink:type="arc" order="1"/>
    <link:label id="lab_ck0001710607_ForeignRiskMember_label_en-US" xlink:label="lab_ck0001710607_ForeignRiskMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Foreign Risk Member</link:label>
    <link:label id="lab_ck0001710607_ForeignRiskMember_documentation_en-US" xlink:label="lab_ck0001710607_ForeignRiskMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Foreign Risk Member</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ck0001710607_ForeignRiskMember" xlink:href="ck0001710607-20260914.xsd#ck0001710607_ForeignRiskMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ck0001710607_ForeignRiskMember" xlink:to="lab_ck0001710607_ForeignRiskMember" xlink:type="arc" order="1"/>
    <link:label id="lab_ck0001710607_S000108559Member_label_en-US" xlink:label="lab_ck0001710607_S000108559Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">American Century Emerging Markets Insights ETF</link:label>
    <link:label id="lab_ck0001710607_S000108559Member_documentation_en-US" xlink:label="lab_ck0001710607_S000108559Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">American Century Emerging Markets Insights ETF, S000108559</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ck0001710607_S000108559Member" xlink:href="ck0001710607-20260914.xsd#ck0001710607_S000108559Member"/>
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    <link:label id="lab_ck0001710607_CashTransactionsRiskMember_label_en-US" xlink:label="lab_ck0001710607_CashTransactionsRiskMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Cash Transactions Risk Member</link:label>
    <link:label id="lab_ck0001710607_CashTransactionsRiskMember_documentation_en-US" xlink:label="lab_ck0001710607_CashTransactionsRiskMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Cash Transactions Risk Member</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ck0001710607_CashTransactionsRiskMember" xlink:href="ck0001710607-20260914.xsd#ck0001710607_CashTransactionsRiskMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ck0001710607_CashTransactionsRiskMember" xlink:to="lab_ck0001710607_CashTransactionsRiskMember" xlink:type="arc" order="1"/>
    <link:label id="lab_ck0001710607_EmergingMarketsRiskMember_label_en-US" xlink:label="lab_ck0001710607_EmergingMarketsRiskMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Emerging Markets Risk Member</link:label>
    <link:label id="lab_ck0001710607_EmergingMarketsRiskMember_documentation_en-US" xlink:label="lab_ck0001710607_EmergingMarketsRiskMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Emerging Markets Risk Member</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ck0001710607_EmergingMarketsRiskMember" xlink:href="ck0001710607-20260914.xsd#ck0001710607_EmergingMarketsRiskMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ck0001710607_EmergingMarketsRiskMember" xlink:to="lab_ck0001710607_EmergingMarketsRiskMember" xlink:type="arc" order="1"/>
    <link:label id="lab_ck0001710607_LargeShareholderRiskMember_label_en-US" xlink:label="lab_ck0001710607_LargeShareholderRiskMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Large Shareholder Risk Member</link:label>
    <link:label id="lab_ck0001710607_LargeShareholderRiskMember_documentation_en-US" xlink:label="lab_ck0001710607_LargeShareholderRiskMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Large Shareholder Risk Member</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ck0001710607_LargeShareholderRiskMember" xlink:href="ck0001710607-20260914.xsd#ck0001710607_LargeShareholderRiskMember"/>
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    <link:label id="lab_ck0001710607_MarketRiskMember_label_en-US" xlink:label="lab_ck0001710607_MarketRiskMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Market Risk Member</link:label>
    <link:label id="lab_ck0001710607_MarketRiskMember_documentation_en-US" xlink:label="lab_ck0001710607_MarketRiskMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Market Risk Member</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ck0001710607_MarketRiskMember" xlink:href="ck0001710607-20260914.xsd#ck0001710607_MarketRiskMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ck0001710607_MarketRiskMember" xlink:to="lab_ck0001710607_MarketRiskMember" xlink:type="arc" order="1"/>
    <link:label id="lab_ck0001710607_MarketTradingRiskMember_label_en-US" xlink:label="lab_ck0001710607_MarketTradingRiskMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Market Trading&#160;Risk Member</link:label>
    <link:label id="lab_ck0001710607_MarketTradingRiskMember_documentation_en-US" xlink:label="lab_ck0001710607_MarketTradingRiskMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Market Trading&#160;Risk Member</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ck0001710607_MarketTradingRiskMember" xlink:href="ck0001710607-20260914.xsd#ck0001710607_MarketTradingRiskMember"/>
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    <link:label id="lab_ck0001710607_C000279569Member_documentation_en-US" xlink:label="lab_ck0001710607_C000279569Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">American Century Emerging Markets Insights ETF Class, C000279569</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ck0001710607_C000279569Member" xlink:href="ck0001710607-20260914.xsd#ck0001710607_C000279569Member"/>
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    <link:label id="lab_ck0001710607_SingleCountryRiskMember_label_en-US" xlink:label="lab_ck0001710607_SingleCountryRiskMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Single Country Risk Member</link:label>
    <link:label id="lab_ck0001710607_SingleCountryRiskMember_documentation_en-US" xlink:label="lab_ck0001710607_SingleCountryRiskMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Single Country Risk Member</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ck0001710607_SingleCountryRiskMember" xlink:href="ck0001710607-20260914.xsd#ck0001710607_SingleCountryRiskMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ck0001710607_SingleCountryRiskMember" xlink:to="lab_ck0001710607_SingleCountryRiskMember" xlink:type="arc" order="1"/>
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