Validate json indentation number

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Hello people.
My api returns the following json:

    "code": 200,
    "status": "success",
    "data": {
        "threatChanges": {
            "229": {
                "1395": {
                    "id": 1395,
                    "value": "-6.50",
                    "color": "",
                    "result": "-6.50",
                    "levelId": "",
                    "dimensionType": 1

It has numbers in the json levels, but when trying to validate it in postman it does not recognize them.

This is the test:
pm.test(“Validación”, function () {

Postman detects me as an error:


How can I perform this validation?