Control transition animation by scroll variable


I'm trying to do this paralax/scroll effect, made with Principle, in proto.io


Is this possible to do with Proto.io? I've downloaded the Principle file example, and basically the scrollY variable controls the animation keyframe, but I can't do this in Proto.io, because there's no way to control, frame by frame, the transition between two screen/container states. 

Thanks a lot,


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