I tested it with Companion & APK on Android 13:
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I've renamed the extension from FilePicker to JewelFilePicker to prevent conflicts with the in-built component.
You can also pick a file from /data/user/0/<packageName>/shared_prefs in the internal storage, e.g. this TinyDB.xml and read and/or copy it.
Of course, it is not necessary to specify the exact directory beforehand. You can also navigate there from the PrivateDir.
the extension you are using is not the same as in first post of this topic?
Correct. I had raised the question of why it shouldn't be possible to pick files from hidden directories (like ASD on Android 11+ or PrivateDir in the internal storage). And apparently it is possible.