ember-bootstrap - rendering "radio" inputs

Using the Ember addon ember-bootstrap I can make a set of radio buttons like this :

with a Controller that looks like this :

export default Controller.extend({

  init() {
    this._super(...arguments);
    this.radioOptions = [
      {
        label: 'Citrus',
        value: 'C',
        inline: true
      },
      {
        label: 'Non-Citrus',
        value: 'N',
        inline: true
      }
    ];
  }

});

The relevant doco is here https://www.ember-bootstrap.com/#/components/forms .

However what I can't do is provide a custom value to each radio button so that I end up with rendered HTML like this :

  <label>Citrus</label>  
  <input type="radio" value="C">
  <label>Non-Citrus</label>  
  <input type="radio" value="N">

I have looked at "Custom Controls" on https://www.ember-bootstrap.com/#/components/forms but I can't see how that applies to this case.