I did the same as you at first TBH, but quickly found that as long as I dumped the files in generally the correct folder structure, Jellyfin would figure it out. And for the few it doesn't, you can manually identify within the webUI as others have pointed out.
I also stressed a bit about shows, but have found that
/Show (YEAR)/Season 1/whatever garbage naming convention the torrent uses
generally gets picked up with no problems, even if there is an extra folder level beyond "Season 1".
It sounds super obvious, but i never thought to cook hasbrowns in the bacon grease... Mostly because I'm fully converted to making bacon in the oven these days.
Definitely going to give this a whirl next time we're doing breakfast.