Yes, I do this in my app. It's well-supported by the platform and quite easy -- there are built-in primitives to call a native function from javascript that ret

Yes, I do this in my app. It's well-supported by the platform and quite easy -- there are built-in primitives to call a native function from javascript that returns a promise, which can then be fulfilled/returned asynchronously on the native side once your long-running calculation or transfer is finished.