Nextcloud AIO or all in one. It works relatively well. I run both my own container and an AIO instance and I’ve been pretty happy with it, I’ll likely migrate to it for my docker only one in the near future. Nextcloud AIO
If you are talking about effectively adding to the WEBDL scene as in taking streams directly from sites and decrypting them you are going to want to start to find your way into the scene more. I have no idea how to but I’d start with a more exclusive site like a private torrent site and work your way up to good standing through other upload grunt work like filling requests etc. This will in turn open you up to more exclusive forums on that site where you can ask this question again.
As far as I know all roads lead to a rooted a android device as a means to then figure out a way to either get he file without the DRM as part of the playback from the App or direct access to the full file in it’s original version and to then enploy the definitely closely guarded secret of how to crack the DRM. This is only stuff I’ve gathered randomly reading things.