Trailing whitespace highlighting in GitHub?

Question

JavaScript

I would like to teach GitHub to highlight the left trailing spaces in the code, in Pull requests and repository files.
Before reinventing the wheel, maybe someone came across a browser plugin or a ready-made JS script for Tampermonkey?
I know how to set up git and the IDE itself so that trailing spaces do not leak into the repository. The question is about highlighting spaces when you read the code on GitHub.