Product Explode plugin will give you the extension or extra panel on product menu on WordPress admin side. In that panel, you will be able to see the list of single products under Grouped product Image with labels on wordpress admin side.You can give the size and name of those labels.
You can drag those labels from table to product image to link or highlight the area of the specific products in the grouped product. It will override the layout of single-product.php page of woocommerce plugin to show the extra product table with labels. It also shows the quantity and add to cart option from where you can directly add the product to your cart.Plugin Link
Wordpress Plugin Features