When exporting your personal Google data using Google Takeout, you get your YouTube playlists in this CSV format:
Playlist ID,Channel ID,Time Created,Time Updated,Title,Description,Visibility PLtnP62Yk9yHUxxxxxxxxxxxxllH4kbjLZ,UCUnD-6xxxxxxxxxIxseeL8g,1984-01-01 13:37:00 UTC,1984-01-01 13:37:00 UTC,3kl,,Unlisted Video ID,Time Added dQw4w9WgXcQ,1984-01-01 13:37:00 UTC
Since the YouTube API only returns the first 100 videos, it would be awesome if you made it possible to import this format into a playlist.
While thinking about this, an even better solution would be to just allow the user to import a list of URLs, like this:
https://www.youtube.com/watch?v=dQw4w9WgXcQ https://vimeo.com/860952021 https://www.youtube.com/watch?v=p5wTH5wFEwg