Set default position/initial state for "while scrolling in view" interaction

So I was trying to create a cool slider. I have taken inspiration from a slider I have seen on another website, I am going to link that website below. To create the slider, I have used “while scrolling in view” interaction and played with some movement to get a smooth result so far. What I am struggling with is that I want the scrolling to start from the middle with “scroll” area available on the left and the right. I am providing the link to my read only below. If anyone has any ideas for this I would be really ecstatic! Cheers!