JSFiddle - React, Tailwind, and code Playground

HTML

<label for="sing_pass" class="label_pass">
<span class="lang" key ="Text33">Label</span>
<input type="text" id="sing_pass" class="input">
</label>

JavaScript

var place = $('.label_pass').find('.lang').text();
$('#sing_pass').attr('placeholder', place)