Liquid Ajax Cart ajaxifies all Shopify product forms by default.

But, for example, if you want to ajaxify only product forms with the data-my-product-form attribute then provide a function as the productFormsFilter parameter:

<script type="module">
  import { configureCart } from '{{ "liquid-ajax-cart-v1.10.3.js" | asset_url }}';

  configureCart('productFormsFilter', formNode => { 
    return formNode.hasAttribute('data-my-product-form') 

Liquid Ajax Cart will call your function and pass the Element object of the product form that is going to add a product to the cart, and proceed with an “Add to cart” Ajax request only if the function returns true.