The problem is that that part of the plot is enacted in a way that is almost completely devoid of animals - any animals in Moana make only occassional brief appearances.
Obviously Animals are an implied part of any story about natural conservation, and they would (hopefully - if it has to happen) expand on that element in the land and its attractions to make sense of it in Animal Kingdom. But in doing that you'd have to open up Moana in a way that's so completely different from the movie that you're not even really engaging with what the IP actually is anymore.
Consider that the only references to animals in any of the songs are the moments where Maui mentions the time he gutted an eel and when Tamatoa remembers when he was a "drab little crab" . . . it paints pretty clearly the fact that, thematically, Moana was not at all about animals.