Google makes it easy to transfer audio from one room to another with a feature called “stream transfer.” This feature allows users to tell Assistant that they will move to another room and play music, among other things. Another audio source at this location instead.
For, eg, you can say like “Ok Google, move music to the living room speaker,” and the wizard-enabled device playback in the living room starts. You can also access the Google Home app and press the “Cast” button to choose the device from your list of speakers that are turned on for streaming also to stream the audio.
If you want to move a YouTube video from a smart screen to a TV, you need to say, “Ok, Google, read it on your living room TV.” Of course, the TV will require to be enabled for streaming with a Chromecast or run Android TV.