如何将字典分配给QML属性？

var myDict = {
    key1: value1,
    key2: value2,
    // ...
};

Item {
    property var dictionary: myDict
}

Text {
    text: dictionary.key1
}

class Dictionary : public QObject
{
    Q_OBJECT
    Q_PROPERTY(QVariantMap data READ data WRITE setData NOTIFY dataChanged)

public:
    QVariantMap data() const;
    void setData(const QVariantMap& newData);

signals:
    void dataChanged();

private:
    QVariantMap m_data;
};

QVariantMap Dictionary::data() const
{
    return m_data;
}

void Dictionary::setData(const QVariantMap& newData)
{
    if (m_data != newData) {
        m_data = newData;
        emit dataChanged();
    }
}

Item {
    Dictionary {
        id: dict
    }
    property var dictionary: dict.data
}

Text {
    text: dictionary.key1
}