How to show a notification button in title bar (or a general button if not possible)?

Question

I would like to add a button to the title bar of my C++/Qt application, like the one for Visual Studio notifications (I've seen other programs using it too, like SourceTree).

I have been searching around for a while but many pages redirect to this or this broken links. I've only found this CodeProject tutorial but my whole project is powered by Qt, not MFC.

Is there any standard/native way to do it using Qt or in C++?

PS: third-party window decoration replacements looks promising, but I would like not to make such replacement on standard Windows frame.