If you're reading reviews on Software Manager, you don't want to be messing with jails.
Just use Flatpaks, and install Flatseal for permissions control over individual packages. They are sandboxed, but with permissive defaults set by the devs, so you can use Flatseal to lock them down, then set permissions you're comfortable with. If it breaks something in that one Flatpak, then just reverse your permissions changes. Simple.