JSFiddle - React, Tailwind, and code Playground

HTML

<div class='result'></div>

JavaScript

var object = {
  level1 : {
     level2 : {
       level3 : 'text'
     }
  }
};

var value = 'level1.level2.level3';

object[value] += 25;

$('.result').text(object[value]);