JSFiddle - React, Tailwind, and code Playground

HTML

<table id="datatable">
<tr>
    <th scope="row">Age: 0-4</th>
    <td>0</td>
    <td>9.7</td>
</tr>
<tr>
    <th scope="row">5-17</th>
    <td>23.6</td>
    <td>18.0</td>
</tr>
<tr>
    <th scope="row">Total 0-17</th>
    <td>20.6</td>
    <td>16.1</td>
</tr>
</table>

JavaScript

var l1 =   $('#datatable td:nth-child(2)').map(function() {
    return $(this).text();
   }).get();

alert(l1);