def METHOD_NAME(self, model: Model, file_name: str):
    """Save a Model instance to a spec file.
    **NOT IMPLEMENTED**
    Parameters
    ----------
    model: Model
        Model instance to save to specs file.
    file_name: str
        File to write the model specs to.
    .. # noqa: DAR101
    .. # noqa: DAR401
    """
    raise NotImplementedError(f"Cannot save models with format {self.format!r}")