Location of Flatpak data and folders?

Where is location of Flatpak data?

I use Gajim 1.8.0 on virtual Whonix OS (v.16 none Qubes) with Flatpak. I want to move my Gajim settings & OMEMO keys from Whonix 16 to Whonix 17. Gajim informs that I should move data from such folders:





But I couldn’t find similar folders. Where is Flatpak apps data in Whonix?

Self Support First Policy for Whonix applies.

Same as on Debian. Question rephrasing and redirection recommended:

Where is Flatpak apps data in Debian?