No.
Or a twitch live stream?
It's up to the app developer to make their app interact with Live Channels.
Is there a definitive list of apps that support the live channels app?
Yes. The answer is yes! I've done both. Try cumulus tv.
A bit difficult to setup, but possible.
Have said this before. Google should make it easy for YouTubers to curate there own live channels. And those channels should automatically play streams when they go live.
And users should have the option to add their YouTube subscriptions to live channels.