Display attributes names for each product in shop catalog in format like "size:x,xxl"

woocommerce-display-attributes-for-product-in-catalog

add_action( 'woocommerce_after_shop_loop_item_title','display_sizes' );
function display_sizes(){
  global $product;
  
  $variations=$product->get_available_variations();
  $count=sizeof($variations);
  $counter=0;
  echo '<span class="sizes">Sizes:';//sizes or whatever u want
  foreach($variations as  $var){  
    foreach($var['attributes'] as $name=>$val){
        $counter++;
        $term=get_term_by('slug',$val,str_replace('attribute_','',$name));
        echo $term->name;
       if($counter!=$count)
       {
         echo ',';
       }
   }
 }
 echo '</span>';
}