True App that shows DV, HDR10+

Since YouTube doesn’t show these only HDR10 are there any sites that show YT like feeds

If you’re talking about publishing your own videos then look into Vimeo. If you’re talking about a site just like regular YouTube where you can watch stuff other people uploaded, I have no idea. But if you’re talking about live TV channels like on YouTube TV, I don’t think there’s anything that would output in those formats 24/7. It would have to depend on the content being played.

P.S. If you are just looking for an app to test out functionality, Kodi is still king in my opinion when it comes to finding movies or shows in these formats. You can also download apps like the official Dolby app that has demo videos.

I doubt it because I never see live feeds in DV or live TV broadcasts and it is only available on VOD and Blu-rays disks.
YouTube does support HDR10+ but your device and TV also need to support it.
If you don’t have full support then it should fallback to HDR10 with static metadata.

I find them on Kodi looking for certain movies. Just wondering since there individuals on youtube that produce videos claiming DV and 10+ and we know Youtube doesn’t show these if they had them somewhere else. Be nice to have a channel that actually showed these so one could test out their TVs capabilities