Sync with Plex Watchlist
Now that Plex has fully released its Discover feature I find myself using its Watchlist a lot to mark things that I plan to watch. It would be great if that could be imported to Simkl. And if possible (but I imagine difficult) also sync the other way, from Simkl to Plex's Watchlist.
I'm aware that Plex does not have an "official" API, but the endpoints exist and quite a few apps already use them. Overseerr for example has Watchlist integration as well: https://github.com/sct/overseerr/blob/be047427df62e480fc9b69cb93258837ed72bcf4/server/api/plextv.ts#L263.