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Granted, it's not within Jellyfin, but https://github.com/advplyr/audiobookshelf has the open-source-self-hosted philosophy of Jellyfin, and is working great so far.
I can't help with the Jellyfin side of things, but I have had great success with this methodology via Plex (even in the free version) using the iOS app Prologue
I mean all power to you, but why would you use a docker container to use youtube-dl? That is just a 20MB or something command line tool I would use on my laptop/desktop computer. Also check out https://github.com/yt-dlp/yt-dlp for faster downloads (at the moment they have the better workaround for the API I think).