Compatibility with Docxbuilder

[amhest]

Is your feature request related to a problem? Please describe.
I have a large rst document which works well with latexpdf but looking to use docx instead via docxbuilder. Document has a mix of images, plantuml and drawio. I followed these instructions for plantuml and it works great but can't get drawio to do something similar; I get this error for every image:

docs/src/arch/02_goals.rst:51: WARNING: cannot identify image file 'docs/src/arch/02_hardware_diagram.drawio'

Describe the solution you'd like
Does sphinxcontrib-drawio generate a well-formed docutils document tree as required by the link above?

If so, I think adding something like this to my conf.py (as instructed above for plantuml) should also work for drawio but I'm not sure I'm finding the right node names etc. I would appreciate your advice.

def setup(app):
    def docx_visit_drawio(self, node):
        def get_filepath(self, node):
            from sphinxcontrib import drawio
            _, filepath = drawio.DrawIOConverter.handle(self, node)
            return filepath
        alt = node.get('alt', (node['drawio'], None))
        # Docxbuilder provides useful methods. See Docxbuilder API reference.
        self.visit_image_node(node, alt, get_filepath)
    # Add the visit method to Docxbuilder
    import docxbuilder
    translator = docxbuilder.DocxBuilder.default_translator_class
    setattr(translator, 'visit_drawio_node', docx_visit_drawio)