I like your idea.
SamsungTV -->Google home
You might be able to use the Bluetooth of the Google home and the Samsung tv to connect for audio from the Google home to the TV but vice versa might be challenging. The Samsung TV s work really well with Samsung wifi speakers and that’s about it. Depending on which ghome you could run an audio cord.
Google speaker ----> Samsung tv (Chromecast?)
Although, the Chromecast ultra makes that connection seamless. Full powered voice control of Netflix, YouTube, and more including YouTube search results. That’s with no smart things integration. With ST community smart apps like cast-web-api and big talker the possibilities are endless. If you go with Chromecast be sure anynet+ is enabled on the sanding tv.
Fwiw my ghome app doesn’t show my 2017SamsungTV as a thing either.