Unique Element Trigger (Slide) for CMS Collection Items

I know this has been asked a ton, but I’m still not quite sure how this works.

Basically, what I’m trying to do is that when one scrolls down on a page, these cards slide in from the left and right, alternating. I’ve been trying to do this with a Scroll Into View trigger, but the problem with this is that the cards are all part of a Collection, meaning that they all just slide into view at once, from the same direction.

How do I make it so that they alternate, and have different delay times? It seems like everything I do will be applied to all Collection Items.