CSS menu with function from another plugin

Hey everyone,

I’m creating my own HTML/CSS menu with external JS which I’am including to the page by TEXT WIDGET. Everything works well, but I thought to make the menu more interesting by adding a counter to every parent category. This counter will showing number of products at the category. Can anyone help mi how to do it? ‘m using WOOCEMMERCE, i found the files, where is the counter used – it’s:

class-product-cat-dropdown-walker.php
class-product-cat-list-walker.php

What’s the way to add the counter to the menu? Do I have to write a new plugin? Actually am not capable to write it. I can write just in HTML and CSS the other codes I can just read, isn’t there easier way to solve my problem?

thx to everyone,
Provox