A trade with Jansen and Grisham as the main pieces seems pretty reasonable. I'm not sure the Padres do it because they only have 3 OF's on their entire 40 man roster right now, so they'd need to acquire an OF or two before they moved Grisham, but if they were to do that, then it fills needs for both teams and it's the type of deal one should reasonably expect in return for Jansen. Grisham seems more likely to post a plus 100 wRC+ than Bellinger is, and he comes with 3 years of cheap control from ages 26-28.
Reality is, Jansen is not going to get any of the Arizona OF's, and likely won't get someone as controllable as Nootbaar. Best bet is to get a similarly valued and controlled player who fills an area of need. Obviously if the Jays did not have a catcher surplus, then Jansen would be an extension candidate right now rather than a trade chip, but since he is a trade chip, you have to factor in a lot of his deficiencies (health, lack of track record, control) into his value. He's probably not going to fetch as much as he should in a trade, which is why some have argued to trade one of the other catchers depending on the return.