How to dynamically spin the odalka in webpack?

Question

Node.js

I use the express framework and I have a question, if I rendered a page and this page has a modal window with additional libraries for forms (let's say flatpickr, inputask, etc.) I want it to dynamically load when the modal is opened. And the template engine I use is pug. It's me who should include the js file in pug using include, right or not?
I just don't quite understand how to work with webpack for express