You don't want to download to JellyFin/TV. Keep the downloads in the original location and make sure hardlinking is enabled, the file will appear in both locations so you can watch and seed at the same time.
https://trash-guides.info/Hardlinks/Hardlinks-and-Instant-Moves/
Unofficial Lemmy Community for the Servarr suite of apps.
Lidarr, Prowlarr, Radarr, Readarr, Sonarr, and Whisparr collectively referred to as "*Arr" or "*Arrs". They are designed to automatically grab, sort, organize, and monitor your Music, Movie, E-Book, or TV Show collections for Lidarr, Radarr, Readarr, Sonarr, and Whisparr; and to manage your indexers and keep them in sync with the aforementioned apps for Prowlarr.