This would be something that Google would need to do - Sonos publish an API for MSP’s etc; to link their services to (that’s if they want their services to be available to Sonos users). You would need to suggest this feature is added to the Google developers and they can then decide if they want to add their audiobooks to the Sonos ecosystem. I would think they need more demand for it from users, before deciding to go down this route.

So no then. Would probably explain why Google Play is such a flop…no integration across platforms means customers vote with their feet...