I have just tested this a little bit, but this should work for you.
Download this zip, https://github.com/zach-morris/kodi_libretro_buildbot_game_addons/raw/main/repository.kodi_libretro_buildbot_game_addons_le_armhf.zip
Install repo from this zip, then install emulator from the new Repo, “Snes9x current” is the SNES one I’ve used, breifly.