This has been one of those components that's been on my todo list for ages, so I'll try to take a stab at it this weekend (life allowing).
From what I remember, it was only feasible with vector animation -- if the animation included an image or image effect (shadows, blur, etc.), there was no way to connect the image files with the JSON data (unless the plugin exported SVG effects, which last time I looked it did not). Our shop has an illustrator/animator so that limitation works for us. YMMV.
I've slept since I last looked at this so I may be completely wrong. I'll update this thread with anything I do or do not pull off.