[
  {
    "op": "core/text-transform",
    "engineConfig": {
      "facets": [],
      "mode": "row-based"
    },
    "columnName": "File",
    "expression": "grel:with([ ['leipzig.tsv','LE'], ['riesa.tsv','RS'] ], mapping, forEach(mapping, m, if(value == m[0], m[1], '')).join(''))",
    "onError": "keep-original",
    "repeat": false,
    "repeatCount": 10
  }
]