Handler when changed child of 'GSettings'

I have two ‘schemas’: “org.example.app” and “org.example.app.extra”

using the “change-event” signal, on “org.example.app” I can run a function when that schema changes, but it doesn’t detect me when "org.example.app.extra" changes

Is it possible to do it without having to add another ‘handler’ for “org.example.app.extra”?
From “org.example.app.extra” can I access its parent schema (“org.example.app”)?

Thanks.

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