https://www.cnet.com/news/roku-streamers-and-tvs-now-work-with-google-assistant-devices/

People with Roku streamers and a compatible Assistant gadget can use voice commands to search for TV shows and movies, and to pause and launch channels, for example. Commands like the following are now available.

Roku TV owners get even more commands, including TV on and off, volume and mute, input switching and the ability to change antenna channels.