Scrobble your local Sonos queue to a Slack channel.
Create a bot integration and give it a name. I suggest Scrobbler Bot. Be sure to invite your bot to the channel you want to scrobble to by @mentioning the bot in that channel.
From a computer on the same network as your Sonos system:
node index.js --token=$TOKEN --channel=$CHANNEL
Where $TOKEN is the bot's API token, and $CHANNEL is the channel you want
to scrobble to.
Scrobbling works by updating the topic of the channel with the artist and track name of the current song.