JSS Spreadsheet nested headers programatically updates

How to update the nested headers programatically.

by Spreadsheet Online

HTML

<script src="https://jspreadsheet.com/v8/jspreadsheet.js"></script>
<script src="https://jsuites.net/v4/jsuites.js"></script>
<link rel="stylesheet" href="https://jsuites.net/v4/jsuites.css" type="text/css" />
<link rel="stylesheet" href="https://jspreadsheet.com/v8/jspreadsheet.css" type="text/css" />
 
<div id="spreadsheet"></div>
 
<input type='button' value='Update'
    onclick="table[0].setNestedCell(0,0,{title:'New title',tooltip:'New tooltip'})">
 
<script>
var data = [
    ['BR', 'Cheese', 1],
    ['CA', 'Apples', 0],
    ['US', 'Carrots', 1],
    ['GB', 'Oranges', 0],
];
 
jspreadsheet.license = 'ZmUwZTZiNDMyMmIxNzQxZDJjOThhNTlhMjdlMWY5NDQyOTY0OGZhMGE0ZmJhN2ZmNmIwMzcxYjQ3ODBlY2EzYTU3YTQ1YjJhZDJhM2Q4YTE2MjY5NzQ0ZDJmZGJhZGRlMDlkYjEwY2ViMDVkOTVkZjk2NTdkYzkxZjBjYzc1ZmEsZXlKdVlXMWxJam9pY0dGMWJDNW9iMlJsYkNJc0ltUmhkR1VpT2pFMk5qQTFNVGd3TURBc0ltUnZiV0ZwYmlJNld5SnFjM0J5WldGa2MyaGxaWFF1WTI5dElpd2lZM05pTG1Gd2NDSXNJbXB6YUdWc2JDNXVaWFFpTENKc2IyTmhiR2h2YzNRaVhTd2ljR3hoYmlJNklqTWlMQ0p6WTI5d1pTSTZXeUoyTnlJc0luWTRJaXdpY0dGeWMyVnlJaXdpYzJobFpYUnpJaXdpWm05eWJYTWlMQ0p5Wlc1a1pYSWlMQ0ptYjNKdGRXeGhJbDE5';

 
var table =  jspreadsheet(document.getElementById('spreadsheet'), {
    worksheets: [{
        data: data,
        columns: [
            {
                type: 'autocomplete',
                title: 'Country',
                width: '200px',
                url: '/jspreadsheet/countries'
            },
            {
                type: 'dropdown',
                title: 'Food',
                width: '100px',
                source: ['Apples','Bananas','Carrots','Oranges','Cheese']
            },
            {
                type: 'checkbox',
                title: 'Stock',
                width: '100px'
            },
            {
                type: 'number',
                title: 'Price',
                width: '100px'
            },
        ],
        minDimensions: [8,4],
        nestedHeaders:[
            [
                {
                    title:...