The NTS shows are all archived on MixCloud.
Obviously no current Roon support for MixCloud. But it’s actually one of the streaming services (along with SoundCloud) that I really miss in Roon, having come from Sonos and LMS (which do both support it).
For now the fall back is Airplay’ing from my phone and bypassing Roon. But it would be a fantastic addition to be able to access my favourite SoundCloud and MixCloud mixes within Roon itself.
Interestingly it looks like NTS are about to launch a premium service (“Be the first to access new tech features across NTS in 2020, like live tracklists and higher bit-rate streaming”). It might be worth potential users contacting them to express an interest in Roon integration. I’d certainly pay for a premium NTS subscription if it worked with Roon. Although I expect Roon users probably make up a tiny proportion of their user base!
Thanks for adding NTS2 
I had previously added it manually but always nice to have it built in in case the stream urls changes. down the line.