I was able to do this by using databricks.sdk.WorkspaceClient. However, I looks like a workaround. I would prefer to read the content of notebooks directly.

databricksURL = dbutils.notebook.entry_point.getDbutils().notebook().getContext().apiUrl().getOrElse(None)
myToken = dbutils.notebook.entry_point.getDbutils().notebook().getContext().apiToken().getOrElse(None)
w = WorkspaceClient(host=databricksURL, token=myToken)
export_response = w.workspace.export(path, format=ExportFormat.JUPYTER)

 Any advice appriciated.