Check available architectures of local .flatpak files?

On flathhb there is a section on every apps page called "available architectures" and it will list off x86_64, arm64, aatch64 etc. However I have some .flatpak files that don't have pages on flathub, just locally. Upon installation some of them are acting weird but I don't know if that's because it's just not meant to run on aarch64, or because of some other problem that could be fixed. I am asking in a general sense, not for help with any particular flatpak, I just want to know how to get that information myself so that now, and if this happens again, I don't waste time trying to fix something that can't be fixed because it literally just won't ever run on the pi