JSFiddle - React, Tailwind, and code Playground

HTML

<script src="https://code.jquery.com/jquery-2.2.4.min.js"></script>
<div id="numPart">
    <div class="inputMGM"><input name="part" id="" class="validate[required]"></div>
    <div class="inputMGM"><input name="part" id="" class="validate[required]"></div>
</div>

<label id="addPart" class="SpaceEnviar" style="cursor: pointer; decoration: underline">ADICIONAR PARTICIPANTE</label>

JavaScript

$("#addPart").on('click', function() {
    var newField = $('.inputMGM').last().clone();
    $(this).before(newField)
});