I don't know anything about JadooTv, but no, you can't add channels made for other devices. The different boxes have proprietary platform software and stream in different ways. Channels aren't directly interchangeable. That's not to say that it's not possible to develop a Jadoo channel for Roku, if they have a compatible stream.
No, I don't work for Roku.
Netflix Player N1000X, XDS 2100X (premature death by lightning)
Roku2 XD 3050X, Roku2 XS 3100R, Roku2 4210R