expected/expression/expression.json

{
  "template": {
    "type": "div",
    "attr": {},
    "classList": [
      "container"
    ],
    "children": [
      {
        "type": "text",
        "attr": {
          "value": "{{content}}"
        }
      }
    ]
  },
  "actions": {},
  "styles": {},
  "data": {
    "content": "Hello World!"
  },
  "apiVersion": {}
}