use xTeVe with Plex.
I gave my roku to goodwill
Jellyfin via Roku too
Emby probably works as well but I've not tried it
They killed them all when they went public.
eyestream was one that worked earlier this year. Think the name changed to livestreamMP...or something.
Roku is garbage. Get a shield.
Roku won't allow them. Only way, I think, is Plex.