I can integrate my Denon AVR with Heos Build-In into Google Home (via Heos), but not natively like the Chromecast Audio. The integration into the Google Home ecosystem therefore seems to me to be similar to that of Sonos (i.e. not really or only for Google users). Streaming ("casting") of audio does not go directly to the Denon AVR.

But maybe someone with the Denon Home 150 will contact me.

Unfortunately, I couldn't find this information anywhere at the manufacturer's or on the web in general. With a bit of luck, someone else will answer your question.