I'm having trouble getting my app to appear in the "app embeds" menu

I’ve searched everywhere but can’t find any documentation, or maybe I’m doing something wrong…

I have no problem creating an app extension and configuring the schema for the individual block.

But I just can’t figure out where and how to set the schema for the app extension in “app embeds.”

in short i wish obtain something like this:

but I don’t know where to put the schema, nor in which file nor which target to use

Can anyone help me or give me some link for documentation?

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