The problem here is that for that purpose, Flatpak is better in nearly every way and is far more universal
I think Snap makes the most sense for something like Ubuntu Core, where it has the unique benefit of being able to provide lower level system components (as opposed to Flatpak which is more or less just for desktop GUI apps), but it doesn’t make sense for much else over other existing solutions
None of those are official though, the Flatpak is the only officially supported Bottles version, and the sandboxing is one reason why they recommend using the Flatpak