Good question.

I have YouTubeTV so I'm guessing for me it will be in the channel listing - like DirecTV's menu.

But I also have prime YouTube... and I'm not sure if subscribing on youtubeTV will also allow me to view it on youtube...not that I would need to use it and I don't know how you will access it on Prime Youtube.... as you suggest I'm thinking it will show up in subscriptions.

I'll do some research and see if I can find the answer. - JamesJM