I noticed that Javascript can run on deck description for desktop. To my knowledge, that is not the case for AnkiMobile. Would adding this functionality be possible in the feasible future? I am aware right now development its ina bugbix stage.
There is no deck overview screen in AnkiMobile - it jumps straight into study when you tap on a deck. And the description was not intended to be a place to run Javascript - I would advise against using it, as it may be filtered out in the future.