While it’s not the definitive certainty yet that you are seeking, there has been a report that at least the Libre app works on the Fairphone 3 running Android 13 (the Fairphone 5 currently runs on Android 13, too). By the way, I tagged this topic we are in as well as the one I linked to and a third one with the hashtag diabetes to better link these.
P.S.: I’ve also shared this request via our community accounts on Mastodon and Twitter now.