Relay/cast and recast music via home assistant

So. my spotify is not displaying options to cast audio to my regular cromecast devices. but i can selsct homeassistant.

then i was thinking if it would be possible to select homeassistant in spotify and then have spotify by default cast to my cromecast devices ?

i have looked at select source. but i cannot make it work.

i would prefer if it was set up in configuration.yaml or such. and not a automation if possible. but first and foremost, id like to get it working.