Webpack files are not present in the extension folder, but they just appears when I’m using the extension, how to find them?

I’m trying to add a new feature to an already existing extension, but there is something wrong with that.

First of all when I’m actually using the extension and running devtools, I can see that here is also loaded the webpack page too , it doesnt exist in my source code folder, looks like it just loaded dynamically and the file I want to improve is located in this webpack page only.
When I’m trying to get the url of this file, I get this: webpack:///popup/index.tsx
There is no folder like that in the source code folder, idk where it is located and how to access it

I’m trying to just find it in my source code folder of the extension and do my modification to this app to use it how I need.