Hey,
Measuring code coverage for the given tests is mostly done for the development part
Since you say you want to measure coverage in browser I assume, that you'll be needing a dashboard and similar metrics that show you the details about the code on the web browser.
If not please correct me.
If it is the case, we can build a Single Page Application(SPA) for the purposes and it should be up and running in a week.
What this app will do is once you run your test suites, it will spin up a SPA on your browser with will show you the metrics for the code coverage.
I have done similar projects in the past with python and pytest with coverage metrics displayed in the browser, and I'm confident that we'll be able to finish it within a week.
Regards,
Alen Thomas