But leaving Flatpak as a corner case for now...
One idea is to introduce `SUBVARIANT` and `SUBVARIANT_ID`.
But, what I'd _really_ like is for this to be cumulative with bootc layers. I'm not sure how exactly that would work (bootc maybe would need to be specially aware?), but I'd like some fields to show the top layer only (name, support info, etc) and others to become _ordered lists_ — like VARIANT and VARIANT_ID.