Use google cast integration with Sonos as output?

Been searching for a way to send unsupported audio to my sonos system. Most everything supports airplay and google cast these days. After searching, Im not seeing anyone even asking about this but the added value it brings to Sonos in my mind makes it an absolutely critical addition to my HA if it is possible.

However, due to me being a dunce when it comes to HA especially since I just built mine a few weeks ago, I have no idea how to even begin getting it to work.

Thank you

They’re not asking because Sonos’ products don’t support Google cast.

Is there still no way to get the vice versa of AirSonos or Aircast? With those two you can cast audio from your iphone to an Android TV.
But the most interessting way is the audio from an Android source to the Sonos speakers…
I’m using an apple tv only for this feature, having the sound from my movies to the One L speakers - without a workaround on android side to get it working I cannot throw the apple tv away with all it’s patronising things on iOS :-/