TV remote voice control
How does iPhone Apple TV Remote verbal commands work?
Apple TV 4K, tvOS 15
Question marked as
Best reply
There is a list of commands for Siri in Apple's support document Use Siri on your Apple TV
The verbal commands are engaged by the actions: Hold down the Siri button on your Siri Remote, say what you want, then release the Siri button.
The most important one is “Find funny cat videos on YouTube.”