I have to edit the config.scm file in order to achieve this, correct?
I’m using approach I saw at aurtzy/uix-config repo - having whole flatpak as a service.
That way I install flatpak apps only through guix (home), so I’m doing reconfigure anyway.
You can see usage at my systems/kocour.scm - but I’m just beginning with Guix, so probably not best one to follow with advices 