I describe the qml property in the following way:

/*!
    \qmlproperty list<PluginParameter> SatelliteSource::parameters
    \readonly
    \qmldefault

    This property holds the list of plugin parameters.

    \sa PluginParameter
*/

I expect qdoc to show both default and read-only hints in the docs. However, when I build the html docs locally, I see the following:

If only the \readonly command is used, the read-only hint is shown correctly.