JSFiddle - React, Tailwind, and code Playground

HTML

<ul>
 <li class="list-item">
    <span class="number">0</span>
     <span><input class="someOtherNumber" type="text" value="10" /></span>
 </li>

 <li class="list-item">
    <span class="number">0</span>
    <input class="someOtherNumber" type="text" value="99" />
 </li>
</ul>

JavaScript

$(".someOtherNumber").keyup(function () { 
      var value = $(this).val();
      $(".number").text(value);
    }).keyup();