[
  {
    "op": "core/text-transform",
    "engineConfig": {
      "facets": [],
      "mode": "record-based"
    },
    "columnName": "dc:identifier",
    "expression": "grel:if(isNonBlank(cells['id'].value),row.record.cells[columnName].value.uniques().join('␞'),'')",
    "onError": "keep-original",
    "repeat": false,
    "repeatCount": 10,
    "description": "Text transform on cells in column dc:identifier using expression grel:if(isNonBlank(cells['id'].value),row.record.cells[columnName].value.uniques().join('␞'),'')"
  }
]