code: def _write_ieeg_json(output_file):
      
      dataset_info = {
          "TaskName": "unknown",
          "Manufacturer": "n/a",
          "PowerLineFrequency": 50,
          "iEEGReference": "n/a",
          }
  
      with output_file.open('w') as f:
          dump(dataset_info, f, indent=' ')
docs: Use only required fields