Hello Ofir,
The Looper Provider Query String cannot return the exact product items. The argument for getting the related products is this:
$args = array(
'post_type' => 'product',
'post_status' => 'publish',
'posts_per_page' => 5, // Number of related products to display
'post__in' => wc_get_related_products( $product_id, 5 ), // Get related products
'orderby' => 'rand' // Order by random
);
You cannot use this argument for a query string because of this wc_get_related_products()
function. Therefore, it is better to create your own Looper Provider Custom instead. If you are not familiar with this type of Looper, kindly check out this documentation for your reference:
Kindly let us know how it goes.