JSFiddle - React, Tailwind, and code Playground

HTML

<script src="https://raw.githubusercontent.com/digitalBush/jquery.maskedinput/master/src/jquery.maskedinput.js"></script>
<input type="text" id="rrn" />

<button type="button" id="btn">9</button>

JavaScript

$("#rrn").mask('99.99.99-999.99');

$('#btn').click(function() {
    $("#rrn").val(function(i, val) {
        return val + '9';
    }).trigger('input');
});