QT, Chromium and Canvas, WebGL, Font, etc. Which way to look?

Question

Canvas

I decided to write a program for personal use that will contain different browser settings profiles. After that, you will need to launch the Chromium browser and pass parameters to it. Set the window size, change all possible prints (canvas, webgl, audio, fonts, clientrect, etc.). Well, accordingly, it is necessary that each profile has its own fingerprints. I decided to dig towards QT + QWebEngine or just QT / C ++ and launch Chromium with parameter passing. Tell me how the same Canvas is replaced (I'm not talking about the technology itself), how to replace and pass a unique value to the browser? I know there are solutions out there. But I want to do it myself) I don’t understand yet in which direction to move. In which case would it be easier to make a substitution? Using QT + QWebEngine or is it just launching chromium with passing parameters?