https://qml.guide/getting-started-with-qml/ 

**QML**, or Qt Markup Language, is a declarative language used to simplify the development with its neatly organized grammatical structure. **QML** **is** used to build QtQuick, to assist in building complex user interfaces. It's an easy to learn Javascript-based declarative markup and allows the quick creation and deployment of GUIs.

Follow the above link to learn how to  deploy a QML based GUI. 
It is built in [qt.io](https://doc.qt.io/qt-6/qtquick-deployment.html)