3 Steps To Setup HomePods Stereo Sound on macOS
Currently, you cannot directly play videos’ audio with HomePods inside sound preferences. Actually, there is an alternative hidden method on your mac.
1. Open Music App
2. Select your HomePods
3. Open Midi App (Pre-installed)
4. Right click Airplay
5. Select the 4th option
You can also control mac volume via HomePods.