↓これは無理
<p class="cart-attribute__field">
  <label for="your-name0">Your name</label>
  <input id="your-name0" type="text" name="attributes[Your name0]" value="{{ cart.attributes["Your name0"] }}">
</p>



lineこれは行ける
<p class="line-item-property__field">
  <label for="your-name">Your name</label>
  <input id="your-name" type="text" name="properties[Your name]">
</p>