Creating body JSON with parameter nested

How I create a JSON with subparameter using graphics interface of N8N? example:
Inside “contact” I have “email”, like this:

What information I must to write to fill the “email” value? I need to generate the JSON above.
n8n_nested

Welcome to the community @adriano.ferreira

The HTTP node does not support dot notation in the body. To achieve that, you need to set an expression in the value. Example: {{ { "email": "[email protected]" } }}

Example workflow
{
  "nodes": [
    {
      "parameters": {},
      "name": "Start",
      "type": "n8n-nodes-base.start",
      "typeVersion": 1,
      "position": [
        250,
        300
      ]
    },
    {
      "parameters": {
        "requestMethod": "POST",
        "options": {},
        "bodyParametersUi": {
          "parameter": [
            {
              "name": "tenant_id",
              "value": "1"
            },
            {
              "name": "login",
              "value": "test"
            },
            {
              "name": "contact",
              "value": "={{ { \"email\": \"[email protected]\" } }}"
            }
          ]
        }
      },
      "name": "HTTP Request",
      "type": "n8n-nodes-base.httpRequest",
      "typeVersion": 1,
      "position": [
        580,
        320
      ]
    }
  ],
  "connections": {
    "Start": {
      "main": [
        [
          {
            "node": "HTTP Request",
            "type": "main",
            "index": 0
          }
        ]
      ]
    }
  }
}
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