Related Product Of Vendor And Related Product Of shop

add_action('woocommerce_after_single_product_summary', 'woocommerce_after_single_product_summary_callback');

function woocommerce_after_single_product_summary_callback() {
   $product_id = get_the_ID();
   $author_id = get_post($product_id)->post_author;
   $args = array(
       'post_type' => 'product',
       'posts_per_page' => -1,
       'author' => $author_id
   );
   $loop = new WP_Query($args);
   if ($loop->have_posts()) {
       while ($loop->have_posts()) : $loop->the_post();
           add_filter('transient_wc_related_' . get_the_ID(), 'wc_related_callback');
       endwhile;
   }
   wp_reset_postdata();
}

function wc_related_callback($values) {
   $product_id = get_the_ID();
   $author_id = get_post($product_id)->post_author;
   $args = array(
       'post_type' => 'product',
       'posts_per_page' => -1,
       'author' => $author_id
   );
   $vendor_products = array();
   $related_array = array();
   $loop = new WP_Query($args);
   if ($loop->have_posts()) {
       while ($loop->have_posts()) : $loop->the_post();
           $vendor_products[] = get_the_ID();
       endwhile;
   }
   if (!empty($vendor_products)) {
       foreach ($vendor_products as $vendor_product) {
           $related_array[] = $vendor_product;
       }
   }
   if (!empty($values)) {
       foreach ($values as $value) {
           $related_array[] = $value;
       }
   }

   wp_reset_postdata();
   return $related_array;
}