JSFiddle - React, Tailwind, and code Playground

HTML

<p ng-app="app" ng-controller='myCtrl as vm' ng-strict-di>
  <input 
  type="checkbox" 
  ng-model="vm.clarooscuro"
  ng-true-value="'claro'"
  ng-false-value="'oscuro'" /> 
  Este campo tiene el value modificado. Ahora vale {{ vm.clarooscuro }}
</p>
<script src="https://cdnjs.cloudflare.com/ajax/libs/angular.js/1.4.8/angular.min.js"></script>

JavaScript

angular.module('app', [])
  .controller('myCtrl', function() {
    var vm = this;
    vm.clarooscuro = "claro";
  })