Jacket is like a torrent tracker consolidator. Is your goal to be able to do a jacket powered torrent search through qbittorrent?
IMO these are complimentary tools and you don’t need to implement jackett as a plugin into qbittorrent. That feels overly complicated.
I would spin up jackett in a docker container and then set it up to do what you need with qbittorrent as your torrent downloader.
Yes… People are stupid