Creating underlying images on a page between sections as you scroll down the page

Site URL: https://alicebaumgartner.com/

Hello,

I'm trying to recreate this same effect on a webpage (where you have images underneath text sections on a page as you scroll down the page). See:

https://alicebaumgartner.com/

Can anyone guide me through how to dothis in squarespace (if it is possible)?

Many thanks