def get_umm(self, umm_field: str) -> Union[str, Dict[str, Any]]:
        """Placeholder.

        Parameters:
            umm_field: Valid UMM item, i.e. `TemporalExtent`.

        Returns:
            The value of a given field inside the UMM (Unified Metadata Model).
        """
        if umm_field in self["umm"]:
            return self["umm"][umm_field]
        return ""
Placeholder.

        Parameters:
            umm_field: Valid UMM item, i.e. `TemporalExtent`.

        Returns:
            The value of a given field inside the UMM (Unified Metadata Model).
        
earthaccess/results.py