That would be great! But it should be quite similar to ranking videos, I guess.
You need a keyword to rank for, a compelling title, write a description with keywords, and choose a good playlist thumbnail.
But I guess the YouTube tools aren't quite built for this. You don't get analytics for your playlists, and it's usually hard to rank with playlists. TubeBuddy would have to add a lot of stuff, but it would definitely be cool.