docs: @Programmatic
      public <T> List<T> fromExcel(
              final Blob excelBlob,
              final WorksheetSpec worksheetSpec) throws ExcelService.Exception {
          final List<List<?>> listOfList =
                  fromExcel(excelBlob, Collections.singletonList(worksheetSpec));
          return (List<T>) listOfList.get(0);
      }