How to make a meta data tag added to every application during compilation

Hello :raised_hand: I want a metadata tag to be attached to every application compiled from my localhost. The tag is :

<meta-data
        android:name="com.google.android.gms.ads.APPLICATION_ID"
        android:value="ca-app-pub-*******-*****"/> 

I know I need to modify :

I just need some guidance of you all

Maybe this can help u

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