Hi and welcome to the forums.
Its not stupid at all, but I have not seen any tech to mix HTML5 and Qt as such.
However,
https://doc.qt.io/qt-5/qtwebengine-features.html
seems to support it to some extend so I wonder if that could be used.
Can you describe in more details in what way support HTML5 so other more into
web than i am can give better suggestions?