@classmethod
def from_json_downstream(cls, json_data):
    """
        Initializes a value object from json_data that's been fetched for downstream data.

        :param json_data: JSON-data that initialize the object.
        :type json_data: dict
        """
    field_id = list(json_data.keys())[0]
    values = json_data[field_id]
    return cls(field_id=field_id, value=values.get('value'), timestamp=
        values.get('timestamp'))
