Relative Notebook URL needed for NbconvertFileHandler (or differently)

[gabyx]

There is a pull request for a notebook extension which uses the html_embed.py exporter.
So far, the exporter can open and convert markdown image links to base64 only if the working directory of jupyter is the same as the opened notebook.ipynb.

Could we generally handover the relative URL as a resource to the NbconvertFileHandler.

class NbconvertFileHandler(IPythonHandler):

    SUPPORTED_METHODS = ('GET',)
    
    @web.authenticated
    def get(self, format, path):
    ...
            output, resources = exporter.from_notebook_node(
                model['content'],
                resources={
                    "metadata": {
                        "name": name[:name.rfind('.')],
                        "modified_date": (model['last_modified']
                            .strftime(text.date_format)),
                        "path" : path   ### < Handing over the path here...
                    },
                    "config_dir": self.application.settings['config_dir'],
                }
            )

such that certain exporters such as html_embed.py can resolve the image links and successfully open the image?

Or is there another better way of doing this? (but needs to be in place and working when all jupyter_notebook_nbextensions are installed)