如何在QML JavaScript函数块中创建C++ QObjor?

Similar to this question ,我想实例化QObject的一个子类,

class CoverageKind : public QObject {
  Q_OBJECT    
public:

  int64_t        id;
  QString        coverage_kind;

  CoverageKind(QObject * parent=nullptr);

  Q_PROPERTY(int64_t id MEMBER id NOTIFY id_changed)
  Q_PROPERTY(QString coverage_kind MEMBER coverage_kind NOTIFY coverage_kind_changed)

signals:
  void id_changed();
  void coverage_kind_changed();
};

qmlRegisterType<CoverageKind>("com.example.CoverageKind", 0, 1, "CoverageKind");

导入后 com.example.CoverageKind ,我可以实例化这个QObject子类,如下所示:

Item {
  CoverageKind {
    id: ck
    Component.onCompleted: {
      console.log('Created CoverageKind! ', ck);
    }
  }
}

Created CoverageKind!  CoverageKind(0x19b51b0)

但是,如果我这样做:

import com.example.CoverageKind 0.1;
Item {
  CoverageKind ck;
  Component.onCompleted: {
    ck = new CoverageKind();
  }
}

我明白了 TypeError: Type error 上 ck = new ...

我有一个习惯用法,我可以从QML JavaScript块实例化C++ QObjor子类吗?

我能做到

var ck = Qt.createComponent("import com.example.CoverageKind 0.1; CoverageKind{}");

这感觉真的很笨重。我也可以创建一个工厂函数,但我希望能够在javascript中更符合人体工程学地创建这些对象。