def METHOD_NAME(self, target_id):
    target_json_file = self._getTargetDir(target_id).File("target.json")
    if not target_json_file.exists():
        raise Exception(f"Target file {target_json_file} does not exist")
    with open(target_json_file.get_abspath(), "r") as f:
        vals = json.load(f)
        return vals