This is a feature request, and not the only place in which it’s been mentioned. I’ll leave this link here if the mods want to merge:
At the moment I find myself on vacation, with my roon arc app working well for Bluetooth to my portable vacation speaker I packed… but the house we rented supports Google Cast, and while it’s a few big steps down from my rig(s) at home, it’s a nice upgrade over my crappy Bluetooth speaker… so I’m casting directly from Tidal and Qobuz to it, rather than using my (preferred) Roon service, because WiFi and less-portable speakers > Roon Arc and Bluetooth portable speakers … would be awesome for us if we could cast!!