https://doc.qt.io/qt-6/qtqml-tooling-qmllint.html talks about qmllint purely as a standalone console tool. However, this is not how users would normally use qmllint.

 
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This page should also mention that:

• The QML Language Server shows linting output in the IDE's code editor: https://doc.qt.io/qt-6/qtqml-tooling-qmlls.html#linting
• qt_add_qml_module() generates CMake targets with the *_qmllint  suffix. Building these targets will cause qmllint to run on the project.