How can I trigger a component animation based of parent scroll position on mobile?

Principle Version: 5.9
macOS Version: Mojave

Need help with How can I trigger a component animation based of parent scroll position??
Can I add a driver keyframe that will let me select a component message event?
How do I do this?
Other competing prototyping tools have this option (Mokup)… but I love Principle and really want to keep using it, but I need this function to create better interactive prototypes!

I was able to trigger it is by placing an empty box at the end on the scroller and then it was triggering the component event with a hover inside/outside. but this works only on desktop and this is useless for me. I need this to work on mobile.
Thanks in advance!