How to display a list of images into 2 columns or 3 columns when creating pdf by automation

[kvngo94]

Hi everyone, 

I have a list of images, and want to show it in columns (2, 3 or more.. which is displayed as same as gallery view ), been trying out but can not achieve it, only can show it row by row by <<start:>> and <<end>> expressions.

For example, I have list of {image 1, image 2, image 3, image 4}, I want to show as below when creating pdf by automation. If anyone has experience with this kind of display, please kindly advise. Thank you.