When pressing F1 to access documentation for a singleton QML type it does not find it. With the following code snippet as an example:

import QtQuick 2.9
import QtQuick.Window 2.2
import QtSensors 5.9 as Sensors
// ...
Item {
    Component.onCompleted: {
        var types = Sensors.QmlSensors.sensorTypes();
        console.log(types.join(", "));
    }
}

and highlighting QmlSensors then pressing F1 will not show any documentation. Changing it to SensorGlobal does not work either. The code snippet is taken from the SensorGlobal QML types documentation (the namespace is a requirement).