Qimage from cpp to python

[gui2one]

This is my first time using pybind11, and I found it great and relatively easy to use ... for simple cases at least.
I have an issue trying to 'export' a Qt5 QImage from c++ to python.

The function I am trying to "export":

QImage loadQtImage(std::string path)
{
    img_data data = load_image(path);

    QImage q_img = QImage(data.pixels.data(), data.width, data.height, QImage::Format::Format_RGBA8888);

    return q_img;
}

PYBIND11_MODULE(gui2oneImageIO, m)
{
  m.doc() = "a pybind11 module loading image files with OpenImageIO";
  m.def("loadQtImage", &loadQtImage);
  py::class_<QImage>(m, "QImage")
      .def(py::init<uchar *, int, int, QImage::Format>());
}

My goal is to then load this QImage in python using PySide2

# load the image from cpp module
img_from_cpp = gui2oneImageIO.loadQtImage(file_path)

# put it in a Qimage
q_image = QImage(img_from_cpp)

But I get a TypeError :

TypeError: 'PySide2.QtGui.QImage' called with wrong argument types:
    PySide2.QtGui.QImage(QImage)
Supported signatures:
    PySide2.QtGui.QImage()
    PySide2.QtGui.QImage(PySide2.QtGui.QImage)
    PySide2.QtGui.QImage(str, int, int, PySide2.QtGui.QImage.Format)
    PySide2.QtGui.QImage(str, int, int, int, PySide2.QtGui.QImage.Format)
    PySide2.QtGui.QImage(bytes, int, int, int, PySide2.QtGui.QImage.Format, typing.Optional[typing.Callable] = None, typing.Optional[int] = None)
    PySide2.QtGui.QImage(bytes, int, int, PySide2.QtGui.QImage.Format, typing.Optional[typing.Callable] = None, typing.Optional[int] = None)
    PySide2.QtGui.QImage(str, typing.Optional[bytes] = None)
    PySide2.QtGui.QImage(PySide2.QtCore.QSize, PySide2.QtGui.QImage.Format)
    PySide2.QtGui.QImage(int, int, PySide2.QtGui.QImage.Format)
    PySide2.QtGui.QImage(typing.Sequence[str])

I feel I am not far from success ( maybe I am totally wrong...)
Am I on the right track ?