Here we go, I decided to try WebAssembly having a project in mind, but before dedicating myself and take on coding, there is always fun of fooling ...
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I actually tried Qt for webasm once a few years back. It was difficult to get the tooling and the enscripten compiler to match or work without building Qt from source since it refused to work with their prebuilt libs. But it did work, at least for building a relatively simple widget based Qt app. The Qt http web support was still broken at the time, though, so I had to patch in and use enscripten url calls directly to the backend. But having a form designer for the ui did make it potentially nice.