JSFiddle - React, Tailwind, and code Playground

HTML

<table>
    <tr>
        <td>Teste</td>
    </tr>
    <!-- Inserir linha aqui! -->
    <tr id="id_2">
        <td>Teste 2</td>
    </tr>
</table>

JavaScript

var idIndex = document.getElementById('id_2').rowIndex;
var table = document.querySelector('table');
var tr = table.insertRow(idIndex);
tr.innerHTML = '<td>Teste intermédio...</td>';