[Feature request] Android Auto access to subscriptions.

[rodin-ia]

Checklist

• I have tested the latest 5.0 beta version, and it doesn't have this feature.
• I have searched for existing issues (open and closed) and confirmed this feature hasn't been requested before
• I believe this feature request will benefit more than 10% of users, not just myself

Feature Description

Hello, thank you for the app. Currently, Android Auto only allows playback from a “playlist,” meaning I have to create my own playlist, add videos to it, and then select and play those videos in AU. Is it possible to add playback from “Subscriptions”?