Torrents for *only* FO4’s DLC are in a sorry state, being few, far between, scattered, out-of-date, and incomplete.
Using what’s available, without having to torrent (and install) an entire extra instance of the main game, (and subsequently fix whatever registry mayhem and hard drive fillage results) one would only be able to get Far Harbor and Automatron in any useful way, as Nuka World is only available in beta, and the same is true for both Contraption and Wasteland Workshops meanwhile, Vault Tec Workshop is wholly absent.