[Home Assistant] Jellyfin "now playing" sensor

ha_jellyfin_nowplaying.yaml

# Creates a binary sensor with the name and type of the currently playing item as attributes
# Replace <SERVER_ADDRESS>, <API_KEY> and <USERNAME>

- sensor:
    name: "Jellyfin User 1"
    scan_interval: 30
    command: >-
      curl http://<SERVER_ADDRESS>/jellyfin/Sessions\?ApiKey\=<API_KEY> | jq '
        (.[] | select(.UserName == "<USERNAME>")) // {} | .NowPlayingItem // {}
        | { 
          type: .Type, 
          name: (
            if .SeriesName then [.SeriesName, .SeasonName, .Name] | join(" - ")
            elif .AlbumArtist then [.AlbumArtist, .Album] | join(" - ")
            else .Name
            end
          )
        }
        | map_values(if . == "" then null else . end)'
    json_attributes:
      - type
      - name
    value_template: "{% if value_json.name is none %}off{% else %}on{% endif %}"