JSFiddle - React, Tailwind, and code Playground

JavaScript

var my_object = {
	object1: {
  	key: 'value',
    key2: 'value2'
  },
  object2: {
  	key: 'othervalue',
    key2: 'another'
  }
}

function doSomething(obj_key) {
	// add a property to the object we want
  my_object.{obj_key}.new_prop = 'this_new_prop';
}

doSomething('object1');

console.dir(my_object);