That won't be possible. Nest Protects do not work with Google. (Home, assistant, etc.) There are no plans announced to integrate it to Google Home in the future. Some very vague "soon" answers have popped up, but given the length of time since Google bought Nest, they'd have done it by now.
@bigj we hear you. Our team is working hard to deliver the best experience for our users. Keep your eye on the Google Nest Community page https://goo.gle/2JvnMRy for any updates. I'd suggest you send feedback about this using this form to let the Google Engineering team know about this. While they won't respond directly back to you, this is the best way to let them know about this. Please let me know if you have other questions or concerns as I will be locking this in 24 hours if I won't hear back from you again. Feel free to start a new thread and we'll be happy to help.
Thanks for answering, DanCoco.