Dietpi Kodi and tvheadend client

New to Kodi but not dietpi as I a couple raspberry pi acting as Roon endpoints. Kodi installs fine on another pi3 and connects to my Emby server backend happily, but I can’t find any pvr services, tvheadend client specifically, in any of the add ons. It’s there in the libreelec version, but not diet pi. Am I missing something simple or is it not there?
Thanks