{
  "format": "jsonl",
  "record_count": 2,
  "fields": {
    "record": [
      "str"
    ],
    "value": [
      "dict"
    ]
  },
  "nested_values": "Preserved JSON objects/arrays; see source-specific fields.",
  "missing": "Absent fields are not imputed.",
  "split_role": "archival_evaluation_not_fresh_training_split"
}