sub media slidehow on product page - Narrative theme

[eliphino]

I would like to limit the number of images in the bottom slideshow/gallery of my product page, I am using the Narrative theme so the gallery has a class of .product__submedia-list

You can see the issue here, underneath the product info grid, it's showing every single varient image, but I'd like it to only show the first 3 images from the media list. Is this possible?

https://mododesign.co.uk/products/vita-table-1

Thanks in advance to any ideas!

Tom