Hi,
This is a fairly large modification and would require you to have knowledge of PHP.
Step 1
At the basic level you will need to find this file sf-post-formats.php
located swift-framework/content/sf-post-formats.php
Step 2
Inside this file, copy the whole function sf_get_post_item() into your child theme.
Step 3
Locate this comment // DETAILS SETUP
and above that copy in the below code:
if ( $post_type == 'product' && is_search() ) {
global $product;
$sku_out = $product->sku;
}
Step 4
Depending on what blog layout you are using you can then echo the variable $sku_out
into the one of the various layouts within that function. An example:
$post_item .= '<div class="search-sku"><p>'.$sku_out.'</p></div>';
Whilst we cannot do the modification for you, this should get you 99% of the way.
Thanks,
David.