Sadly, it is not. At least not under configuration DVB Inputs TV Adapters or Networks...
This is my docker-compose:
version: "2"
services:
tvheadend:
image: linuxserver/tvheadend
container_name: tvheadend
environment:
- PUID=1000
- PGID=1000
- TZ=Europe/Berlin
volumes:
- /srv2/docker/tvheadend/config:/config
- /srv2/docker/tvheadend/recordings:/recordings
ports:
- 9981:9981
- 9982:9982
# devices:
#- /dev/dri:/dev/dri #optional
#- /dev/drb:/dev/dvb #optional
restart: unless-stopped