show multiple sticky overlay images on scroll

Hi

We are migrating a site from Webfl** to Wordpress with GP Premium.

We need to replicate an effect on the landing page like in the third section on this landing page: https://terms.tech
It consists of three images that seem to be sticky within the left column of the section container, and they appear as the right section scrolls.
The images are identical except for some detail. The desired effect is to have that detail appear on scroll.

I'm kind of stuck on this.

Any help or suggestion would be highly appreciated!