How to get each "value" from iterator into BannerBear modification field

Hi,

This is probably a super simple fix but struggling to find an answer!

I have an iterator which is separating an array into 1 single bundle, which is what i want.

From there i want to use each value (the values are URLs) for each dynamic image placeholder in a multi-tile image template in BannerBear (e.g value 1 for box 1, value 2 for box 2, etc), how do i go about this?

This is the view of the modification fields in bannerbear: