To add a heading text above Addons Product, like this.
You can use this code to Code Injection > Footer.
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.7.1/jquery.min.js"></script>
<script>
$(document).ready(function(){
$('<h3 class="addons-custom-heading">Add Ons Products</h3>').prependTo('section.product-add-ons');
});
</script>
You can change text here.
