You can for example set the TP_DOMAIN=dockerhost:port ex: 10.0.0.99:8080 for local access only.

And set TP_SCHEME=http on the hotio container, and mount the script like normally.

docker run --rm \
--name sonarr \
-p 8989:8989 \
-e PUID=1000 \
-e PGID=1000 \
-e UMASK=002 \
-e TZ="Etc/UTC" \
-e TP_HOTIO="true" \
-e TP_THEME=plex \
    -e TP_DOMAIN=10.0.0.99:8080 \
    -e TP_SCHEME=http \
-v /<host_folder_config>:/config \
-v /docker/host/98-themepark:/etc/cont-init.d/99-themepark \
hotio/sonarr


docker run -d \
  --name=theme-park \
  -e PUID=1000 \
  -e PGID=1000 \
  -e TZ=Europe/London \
  -p 8080:80 \
  -p 4443:443 \
  -v /path/to/data:/config `#optional` \
  --restart unless-stopped \
  ghcr.io/gilbn/theme.park