Suppose you imported a lot of products, but some products have no featured image, you can follow these steps to set the same image for these products.
Use this code to Code Injection – Footer
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.7.0/jquery.min.js"></script>
<script>
$(document).ready(function(){
$('.grid-image-wrapper').not('img').append('<img class="image-una" src="https://images.squarespace-cdn.com/content/v1/6541f43d1e536d4a5a6f63e4/1701745149754-NG3P9BAMX4TBBWQXGYP8/Image_Unavailable.jpg?format=500w" width="300px" height="300px"/>');
});
</script>
Result:
