[
  {
    "op": "core/column-addition",
    "engineConfig": {
      "facets": [],
      "mode": "row-based"
    },
    "baseColumnName": "M|UMF",
    "expression": "grel:value.split(' : ')[0]",
    "onError": "set-to-blank",
    "newColumnName": "4060a",
    "columnInsertIndex": 3
  }
]