example.json

{
  "variables": {
    "var1": {
      "type": "Str",
      "value": "Value 1"
    },
    "var2": {
      "value": "Value 2"
    }
  },
  "document": {
    "title": "My Title ${var1}",
    "author": "My author",
    "creator": "My Creator",
    "key_words": "My Keywords",
    "language": "My Language",
    "subject": "My subject",
    "page_size": "A4",
    "margins": {
      "left": 36.0,
      "right": 36.0,
      "bottom": 36.0,
      "top": 36.0
    }
  },
  "content": {
    "header": {
      "content": [
        {
          "@type": "P",
          "value": "Hola mundo ${json(hello)}",
          "alignment": "ALIGN_RIGHT"
        }
      ]
    },
    "body": {
      "pages": [
        {
          "content": [
            {
              "@type": "P",
              "value": "Hola mundo ${var2} ${json(config.val1)}",
              "size": {
                "width": 100,
                "height": 50
              },
              "position": {
                "x": 100,
                "y": 100
              }
            }
          ]
        },
        {
          "content": [
            {
              "id": "abcd_123",
              "@type": "P",
              "value": "Hola mundo ${json(config.val1)}",
              "alignment": "ALIGN_RIGHT",
              "size": {
                "width": 100,
                "height": 50
              },
              "position": {
                "x": 100,
                "y": 100
              }
            }
          ]
        }
      ]
    },
    "footer": {
      "content": []
    }
  }
}