They gave me template on their forum.
https://forums.nextpvr.com/showthread.php?61698-Could-someone-provide-an-Unraid-template&p=538302#post538302
Thanks guys.
NextPVR v5
https://hub.docker.com/r/nextpvr/nextpvr_amd64/
Much more user friendly than TVHeadend!
I tried to create one myself, but as it would be my first one, it failed no XP doing that!