title: Use liquid object in json scheme shopify
body: <p>Is there any option to use a liquid object in json scheme tag?
  For example I have a product-template.liquid file which contains following schema:</p>
  
  <pre><code>{% schema %}
  {
    "name": "Product pages",
    "settings": [
      {
        "type": "text",
        "id": "text_custom_1",
        "label": "Custom text"
      },
    ]
  }
  {% endschema %}
  </code></pre>
  
  <p>What I would like to acheive is getting a dynamic id for the product as id for the custom field like so:</p>
  
  <pre><code>{% schema %}
  {
    "name": "Product pages",
    "settings": [
      {
        "type": "text",
        "id": "text_custom_1_{{%product.id%}}",
        "label": "Custom text"
      },
    ]
  }
  {% endschema %}
  </code></pre>
  
  <p>But that gives json syntax error. Is the above possible in some way?</p>