I use voice in the search box, but it's been hit and miss. That's not the Siri support you're referring to right?

How do you use Siri with Apple TV? Is that to launch an app?
I've tried using Siri on Apple Watch when driving, to change the music. But it's mostly hit and miss.
I've gotten less than 50% success rate.

Basically Siri cannot understand Malaysian English accent. You have to speak like an American