@QmlAnonymous

Declares the enclosing type to be available, but anonymous in QML. The type cannot be created or used to declare properties in QML, but when passed from C++, it is recognized. In QML, you can use properties of this type if they are declared in C++.

QML_IMPORT_NAME = "com.library.name"
QML_IMPORT_MAJOR_VERSION = 1
QML_IMPORT_MINOR_VERSION = 0 # Optional

@QmlAnonymous
class ClassForQml(QObject):
    # ...