How to use the flasgger.utils.get_vendor_extension_fields function in flasgger

),
            },
            "paths": self.config.get('paths') or defaultdict(dict),
            "definitions": self.config.get('definitions') or defaultdict(dict)
        }

        openapi_version = self.config.get('openapi')
        if openapi_version:
            data["openapi"] = openapi_version
        else:
            data["swagger"] = self.config.get('swagger') or self.config.get(
                'swagger_version', "2.0"
            )

        # Support extension properties in the top level config
        top_level_extension_options = get_vendor_extension_fields(self.config)
        if top_level_extension_options:
            data.update(top_level_extension_options)

        # if True schemaa ids will be prefized by function_method_{id}
        # for backwards compatibility with <= 0.5.14
        prefix_ids = self.config.get('prefix_ids')

        if self.config.get('host'):
            data['host'] = self.config.get('host')
        if self.config.get("basePath"):
            data["basePath"] = self.config.get('basePath')
        if self.config.get('schemes'):
            data['schemes'] = self.config.get('schemes')
        if self.config.get("securityDefinitions"):
            data["securityDefinitions"] = self.config.get(
                'securityDefinitions'