@pratik From what I’ve seen, there’s no auto-import of channel descriptions at this point. The Follow Channels feature does require the Play subscription, but it’s a manual* process even then. But nothing requires a YouTube Premium subscription, except you can sign in with your credentials to not see YouTube’s in-video ads. (*There’s a shortcut action that could be used to whip up a a quick way to follow a bunch of channels, and supposedly you can get your list of subbed channels from Google Takeout.)