JSFiddle - React, Tailwind, and code Playground

HTML

<table>
<tr><td contenteditable>My_Name</td><td>Surname</td></tr>
<tr><td contenteditable>My_Name2</td><td>Surname2</td></tr>
</table>

JavaScript

jQuery(document).ready(function(){


   
$('td').keyup(function(evt){
    if(evt.keyCode == 40){
        event.preventDefault();
        var cellindex = $(this).index()
        var rowindex = $(this).parents('tr').index() + 1
        $(this).parents('table').find('tr:eq('+rowindex+') td:eq('+cellindex+')').focus()
    }
})
});