Plugin failing to extract the result value because it's looking for different data structure

The RONL_LeeftijdsInformatie DMN returns results in this format:

json{
  "AOWDatumAanvrager": {
    "type": "String", 
    "value": "2047-12-12",
    "valueInfo": {}
  }
}

But the code expects this format:

json[
  {
    "AOWDatumAanvrager": {
      "value": "2047-12-12"
    }
  }
]