I once did something similar using sockets and Cloudflare's Durable Objects. I had my current playing song, workout minutes and git commit count.
It was a bit unreliable when I switched to Apple Music so it's gone away for now.
This has inspired me to make it again.
Your project also sounds interesting. I did think about how I could add/track loads of different things on my site, but given it's a static website, I decided to keep things simple.
Music was a bit tricky to track and the update frequency would have been too high for my site so I just left it out for now. Maybe I'll go back and change that one day in the future if I change my mind.