That’s very uncommon. Most shows we get our hands on have already been added to thetvdb aside from your garden variety special interest shows or sports. Plex will not scrape the “Optional_Info” if the library type is TVSHOWS. It would if type was OTHER VIDEOS.
However, you can embed the info into the files metadata if you have MP4 files. Plex would indeed scrape that and use it for the title.
https://support.plex.tv/articles/200241558-agents/
https://support.plex.tv/articles/200220717-local-media-assets-tv-shows/
It would look something like this.
