An iOS dev's experience with React Native

While this is certainly feasible (largely depending on the requirements of your app), it is important to clarify that RN never promised "write once ship twice".

RN's promise is "learn once, write anywhere", meaning that the technology and mental model is what transcends platforms, not the codebase itself.

Just wanted to make this clear so as to avoid any possible frustration for newcomers after the fact.

You can't dynamically import dependencies - so if you're wanting to load JSON dynamically you should be using other mechanisms (even if it's just a FS operation or having an internal service to return JSON).