Slint UI does have bindings in other languages, but tutorials and docs are still lacking. Qt Bridges is a new option on the way for leveraging Qt with Rust and other language bindings.

Link: https://www.qt.io/development/qt-framework/qt-bridges

Qt already has really good binding, see Pyside6 for instance. GTK similarly through introspection.

Not sure why you want to build desktop GUIs using web tech though.