Example : Round prices
Logic
Script to round prices
JS Code:
<script>
/* get all products to loop on */      
function getProductElements(element) {
    return [...element.querySelectorAll(`.fs-results-product-card`)];
}
  
function hooks() {
    SerpOptions.registerHook('serp-product-grid', ({products, element}) => {
        for (const productElement of getProductElements(element)) {
            /* get product data */
            if(productElement.dataset && productElement.dataset.productId && products[productElement.dataset.productId]){
              const productID = productElement.dataset.productId;
              const data = products[productID];
              const priceEl = productElement.querySelector('.price-container .price');
              if(priceEl && priceEl.textContent.match(/([.,0-9])+/gi,'') && priceEl.textContent.match(/([.,0-9])+/gi,'')[0] ){
                let price = Number(priceEl.textContent.match(/([.,0-9])+/gi,'')[0]);
                let roundedPrice = Math.round(price).toFixed(2);
                                                            
                if( !priceEl.classList.contains('isp-cstm-price') ){
                  priceEl.textContent = priceEl.textContent.replace(/([.,0-9])+/gi, roundedPrice);
                  priceEl.classList.add('isp-cstm-price');
                }
              }
              
              
            }
        }  
    });
}
// execution here
if (window.SerpOptions) {
    hooks();
} else {
    window.addEventListener('fast-serp-ready', function () {
        hooks();
    });
}
</script>