I don't like the idea of using a Chromium-based engine for the Search app considering Google is trying to add DRM to the Internet using it, but QtWebEngine uses Chromium and it would be the easiest one for me to use.

I'd prefer to use something different, maybe WebKit or Gecko at least. Only issue is I'd have to figure out how to hook the browser up to the UI and allow injecting CSS as I've stated in the long document.