def METHOD_NAME(self, uri: str, class_config: 'ClassConfig',
         crs_transformer: 'CRSTransformer') -> None:
    """Save labels as a GeoJSON file.
    Args:
        uri (str): URI of the output file.
        class_config (ClassConfig): ClassConfig to map class IDs to names.
        crs_transformer (CRSTransformer): CRSTransformer to convert from
            pixel-coords to map-coords before saving.
    """
    from rastervision.core.data import ChipClassificationGeoJSONStore
    label_store = ChipClassificationGeoJSONStore(
        uri=uri,
        class_config=class_config,
        crs_transformer=crs_transformer)
    label_store.METHOD_NAME(self)