There is no specific purpose of using Angular for a chrome extension to build, and there is no such necessity for the same.

Even you can create your chrome extension with simple HTML, CSS and JS file that’s it.

I am just sharing this article for those who are looking for the way to build chrome plugin using Angular, Actually, Sometimes your chrome plugin gets too large to handle using plain JS so, in that case, using framework is a better approach to handle easily.

Even you can use other tiny libraries too like React or VueJs for the same.

Again, It’s totally up to you what you choose.