Hey there, we currently have the background play feature with YouTube Premium subscription. The feature let's you play videos on your mobile device while using other apps or when your screen is off. Learn more about this here: https://goo.gl/dHUkDL
Ah, got it! Thanks for the feedback. Can you also submit this using our feedback tool? Here are the steps: https://goo.gl/WdI0BK . This will help us prioritize the request.