ToothPick is a web application that lets you easily subscribe to media playlist web pages, it'll use yt-dlp to fetch the media and download them in a directory and file format that is perfect for Jellyfin.
If you create a Jellyfin library that points to the ToothPick library and make sure you turn on file watching, you immediately get the content in Jellyfin without any intervention!
I've just added images and more descriptions about each page of the web application in the GitHub readme. It should provide a nice overview now!