the artifacts is stored as a dictionary with the name of the parametr as the key, and values

{'data_id': {'name': 'data_id', 'size': 39, 'type': 'string', 'mode': <ArtifactModeEnum.output: 'output'>, 'url': 'a big string', 'hash': 'some numbers', 'timestamp': datetime.datetime(2023, 5, 10, 8, 56, 10), 'metadata': {}, 'preview': '(data.UID:>147)AND(data.UID:<148)'}}

i need to access the string in the preview using parameter override logic, how can i get the value of the preview key of the artifact