Unsolved Qt Quick 3D use 3D models with skeleton

[Dmitry87]

In Qt 6 Model Item has a skeleton property which can be used to animate models: https://doc-snapshots.qt.io/qt6-dev/qml-qtquick3d-model.html
Here is a working example of skeleton animation: https://doc-snapshots.qt.io/qt6-dev-cmake/qtquick3d-skinning-example.html
I have a 3D model with skeleton, how can I load it to be able to animate it in QML?
Is a specific model file format required? So far I tried *.mesh, but it doesn't seam to have bones and the skeleton pointer is null.