I need to Customize Fancy Product Designer Plugin

I need to customize some Javascript in the Fancy Product Design Plugin. You definitely have to be very experienced in javascript. Here is the plugin: https://codecanyon.net/item/fancy-product-designer-woocommercewordpress/6318393. Please write: "I'm a javascript expert" at the beginning of the application.

I really need to start ASAP. I've very specific requirements. Please don't apply if you are a WordPress developer.