There is a way to add some metadata to AndroidManifest.xml for an app, a service or an activity (https://stackoverflow.com/a/38699357/1263771):

<application android:icon="@drawable/icon" android:label="@string/app_name">
    <meta-data android:name="my_test_metagadata" android:value="testValue" />
    ......
</application>

How to get that metadata from the installed app by the adb command?

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