Hi,
Yes, you need to do add custom code via the menu Display>Views.
Turn on the "Display view files" setting of the HikaShop configuration and you'll be able to easily see which view file you need to edit.
www.hikashop.com/support/documentation/1...-display.html#layout
It will probably be "listing_img_title".
There, you'll have to run a MySQL query to load the images from the hikashop_file table based on the file_ref_id equal to the product_id of the product and then display the images like it's done for the main image with a call to getThumbnail