Make something like Discord Rich Presence

I haven’t seen clarification on whether server‑side or serverless‑originated activity updates are intended to be supported. My use case is: a web app (HTMLPlayer (beta)) sends some state to a backend (or serverless function), and that updates my Fluxer activity. Will this be supported? I’m mainly asking because Discord explicitly forbids RPC from external servers unless you have special permission, and I would love it if Fluxer supported it via server.