class CppObj : public QObject
{
    Q_OBJECT
    QML_ELEMENT
    Q_PROPERTY(MyEnum value READ value WRITE setValue NOTIFY valueChanged FINAL)

public:
    explicit CppObj(QObject *parent = nullptr) : QObject(parent) {}

    enum MyEnum {
        Alpha,
        Bravo,
        Charlie
    };
    Q_ENUM(MyEnum)

    MyEnum value() const { return m_value; }
    void setValue(MyEnum value)
    {
        if (m_value == value)
            return;
        m_value = value;
        emit valueChanged(m_value);
    }

signals:
    void valueChanged(MyEnum value); // qmllint and qmlsc need this to be fully-qualified, "CppObj::MyEnum"

private:
    MyEnum m_value = Alpha;
};

import QtQuick
import TypeQualificationStudy

Window {
    width: 600
    height: 400
    visible: true

    CppObj {
        id: cppObj
        value: CppObj.Bravo // OK
        onValueChanged: console.log(value) // Warning: Type MyEnum of parameter value in signal called valueChanged was not found, but is required to compile onValueChanged.
    }

    Component.onCompleted: console.log(cppObj.value) // OK
}