<fieldset class="c-checkbox">
    <p>
        <label>
            <input name="" value="" type="checkbox">
            <span class="wpcf7-list-item-label">Electronic Bronze Car</span>
        </label>
        <label>
            <input name="" value="" type="checkbox">
            <span class="wpcf7-list-item-label">Incredible Soft Computer</span>
        </label>
        <label>
            <input name="" value="" type="checkbox">
            <span class="wpcf7-list-item-label">Rustic Wooden Ball</span>
        </label>
        <label>
            <input name="" value="" type="checkbox">
            <span class="wpcf7-list-item-label">Intelligent Cotton Hat</span>
        </label>
        <label>
            <input name="" value="" type="checkbox">
            <span class="wpcf7-list-item-label">Refined Steel Shirt</span>
        </label>
        <label>
            <input name="" value="" type="checkbox">
            <span class="wpcf7-list-item-label">Ergonomic Plastic Shoes</span>
        </label>
    </p>
</fieldset>
<fieldset class="c-checkbox">
   <p> {{!-- WP Contact Form 7 generated --}}
    {{#each checkbox}}
    <label>
      <input name="" value="" type="checkbox">
      <span class="wpcf7-list-item-label">{{ checkbox.label }}</span>
    </label>
    {{/each}}
  </p>
</fieldset>
{
  "checkbox": [
    {
      "checkbox": {
        "label": "Electronic Bronze Car"
      }
    },
    {
      "checkbox": {
        "label": "Incredible Soft Computer"
      }
    },
    {
      "checkbox": {
        "label": "Rustic Wooden Ball"
      }
    },
    {
      "checkbox": {
        "label": "Intelligent Cotton Hat"
      }
    },
    {
      "checkbox": {
        "label": "Refined Steel Shirt"
      }
    },
    {
      "checkbox": {
        "label": "Ergonomic Plastic Shoes"
      }
    }
  ]
}

Markup for this component reflects the WordPress Contact Form 7 plugin.