For admin form UI checkbox components that use the 'toggle' (like Catalog > Product > [product record] > Enabled) - I can see a few references to the UI component configuration using:
<field name="my_field">
<argument name="data" xsi:type="array">
<item name="config" xsi:type="array">
<item name="sortOrder" xsi:type="number">15</item>
<item name="dataType" xsi:type="string">boolean</item>
<item name="formElement" xsi:type="string">checkbox</item>
<item name="prefer" xsi:type="string">toggle</item>
<item name="label" xsi:type="string" translate="true">Enabled</item>
<item name="valueMap" xsi:type="array">
<item name="true" xsi:type="string">1</item>
<item name="false" xsi:type="string">0</item>
</item>
<item name="default" xsi:type="string">1</item>
</argument>
</field>
That'll give me the little toggle with the 'Yes / No' labels - is it possible to change the 'Yes / No' to something else? (Active / Inactive)