What problem does this feature solve?

Currently there is no way to import new webpack plugins to the vue.config.js. At least not that I know of. Please enlighten me if I'm mistaken.
My use case is that I've made modifications to an already existing webpack plugin, and I want to use my version instead.

What does the proposed API look like?

// vue.config.js
import NameOfPlugin from 'path/to/plugin';

module.exports = {
  configureWebpack: {
    plugins: [
      new NameOfPlugin()
    ]
  }
};