QtQuick3D access Model skeleton

[Dmitry87]

I use this tool to convert a glTF model with skeleton to a QML item and use it my qml 3D scene: https://doc.qt.io/qt-5/qtquick3d-tool-balsam.html
The model has a skeleton with 3 bones. I try to access the skeleton from the Model items: Model.skeleton, but it always returns null and onSkeletonChanged is never called.

    Model {
        source: "meshes/mesh_0.mesh"

        Component.onCompleted:
        {
            console.log("test1 " + skeleton) // shows "test1 null"
        }
        onSkeletonChanged:
        {
            console.log("test2 " + skeleton) // never called
        }
    }

How can I access the skeleton?

Scene, generated by balsam tool: https://drive.google.com/file/d/1p8sb-4qxep8n-EuNHJ_YB9dTT5k5LvqB/view?usp=sharing
Original 3D model: https://drive.google.com/file/d/1XeWCL81sk0iyNECiUXbPNTS7tdbvI0yv/view?usp=sharing