[
  {
    "op": "core/column-addition",
    "engineConfig": {
      "facets": [],
      "mode": "row-based"
    },
    "baseColumnName": "E|MEDGR",
    "expression": "grel:'MEDGR: ' + value",
    "onError": "set-to-blank",
    "newColumnName": "8011",
    "columnInsertIndex": 3
  }
]