As https://doc.qt.io/qt-6/qtqml-typesystem-valuetypes.html#property-change-behavior-for-value-types says, "Some value types have properties".

It would be great to have these properties documented formally in a structured way, like how \property is used for OQbjects (or \qmlproperty.

• https://doc.qt.io/qt-6/qml-font.html has a clear albeit manually handwritten list of properties.
• https://doc.qt.io/qt-6/qml-color.html does not list any properties at all. You can only discover (some) of its properties by scrutinizing the code snippets further down the page, or the source code itself.