I haven’t tried it either, but I think you mean roninOS from RoninDojo, right? I looked at the docs and they mention there’s no image for Raspberry Pi. So yeah, looks like you’re on your own with version 2.X. Good luck!
+1, I’ve used it on a Pi 4 but not 5. It should generally work the same way, just faster. However, if the installer is set up for the 4, you might hit some bumps. Had a similar issue before, one little fix from the devs sorted it out.