Injecting only particular .js & .css files that are meant for an HTML file

Suppose I have two HTML files (`index.html` & `about.html`); For the injection, I don't want both to share same `.js` and `.css` files. I only want `index.js` & `index.css` to be injected into `index.html`, and `about.js` & `about.css` into `about.html`. I think the best way to do it is using the `transform()` option, but how?

Start by reading the plugin's transform() option and how it selects assets for HTML injection. The desired outcome is for index.html to receive only index.js and index.css, while about.html receives only about.js and about.css.

Written by the indexing model from the issue text.