optgroups: {
        core: {
          en: 'Item'
        }
      }

{
  "condition": "AND",
  "rules": [
    {
      "id": "price",
      "field": "price",
      "type": "double",
      "input": "text",
      "operator": "less",
      "value": "10.25"
    }
  ]
}