I don’t have any personal experience with it, I just read it here on the forum.
This looks like worth a shot (Hi Reinhard ^-^):
For more examples search the forum for “LTE telemetry” 
Dragonlink also supports full (two-way) MAVLink telemetry together with the RC link. ELRS currently doesn’t support MAVLink, if I’m not mistaken (please correct me if I am). Crossfire theoretically does but I didn’t have much luck with it last time I tried it.