how to set a1,b1 field readonly in jquery table2excel plugin?

<script src="https://cdn.rawgit.com/rainabba/jquery-table2excel/1.1.0/dist/jquery.table2excel.min.js"></script>
<table id="table2" border="1">
    <thead>
        <th>Sr</th>
        <th>Name</th>
        <th>Location</th>
        <th>Job Profile</th>
    </thead>
    <tbody>
        <tr>
            <td>1</td>
            <td><p>Amit Sarna</p></td>
            <td>Florida</td>
            <td>Data Scientist</td>
        </tr>
</tbody>
</table>
<button onclick="ExportToExcel()">Export table to excel</button>
</html>
<script>
  function ExportToExcel() {
    $("#table2").table2excel({
      filename: "file.xls",
      exclude_inputs:true,
      ignoreColumn: ['A1']
    });
  }   
</script>

I want to set readonly column values in excel file.but i cannot set read only properties. please help me to solve this