Different image size on another page

Good day,

First of all, wonderfull plugin! Everything works very well on my website. I’ve managed even to exclude the images I don’t want to load with the plugin with some code in functions.php

Anyway, my question is now that most of the pages with images are just normal landscape images. However, on another page I would like to have portrait pictures who have other dimensions and should be portrait-pictures. How can I specify other picture dimensions for the thumbnail and main image for a specific page?

https://www.ads-software.com/extend/plugins/photospace/