1. save js slider instance in global `slider` variable  (add `window.slider =`) -
current:
   $('.product-image-thumbs').bxSlider({
should be:
    window.slider = $('.product-image-thumbs').bxSlider({

2. paste  the code to the end of the page(before </body>)
    <script src="https://v2.rest-ar.com/restar-injector.js"></script>
    <script defer>
        window.RestARInjector.init({
            bxSlider: window.slider,
            gallery_selector: '.product-image-gallery',
            product_selector: '.model-ref',
            models_list: 'gioseppo',
        })
    </script>