Filter the gallery block image link size

Hi. I am trying to find a solution for gallery blocks linking to the large image instead of the full size.

I was suggest to use this filter which is compatible with a different lightbox plugin:

function custom_check_image_size($attr){
    $attachment_img_id = attachment_url_to_postid( $attr['href'] );
    $large_attachment_image = wp_get_attachment_image_src( $attachment_img_id, 'medium' ); 
    $attr['href'] = $large_attachment_image[0];
    return $attr;    
}
add_filter('slb_process_link_attributes', 'custom_check_image_size',0);

Do you have a filter for you plugin that can be hooked into the image link properties so I can make the change of the iamge link but keep using your plugin?

Thanks.