Unable to change parallex scroll direction

I am trying to use parallex animation - http://parallax-scroll-experiment.webflow.io/ But i want to change scroll direction. Right now its working with page scroll down event - i want to change it to page scroll up events.

I would reverse the animation so it will start at 100% pagescrolled and the finish is at 0% page scrolled.

BUT: For a scroll up event you first have to scroll down/be at the bottom. This can be done by costum code what automatically jumps down to the bootom of the scrollbar/site…