I haven’t branched out much, I’m afraid. Using the default Kodi theme, only split by TV/movies, and I just created a new jellyfin account specifically for Kodi.
However, this page says that you create Kodi profiles for each user, then you can log each one in to jellyfin under their own profile. This lets you use the native Kodi users for switching between jellyfin users. But it does sound like a bit of work to set up.