Getting field values from firebase response

1

I’m trying to get the value of ‘createTime’ alone for all the documents. But it throws me an ‘undefined error’

MY FORMULA:
outputs[“HTTP request”].resBodyParsed[‘createTime’]

FIREBASE RESPONSE SCHEMA:

"documents": [
    {
      "name": "projects/mocktables/databases/(default)/documents/products/1",
      "fields": {
        "id": {
          "integerValue": "1"
        }
      "createTime": "2023-03-11T14:05:20.736608Z",
      "updateTime": "2023-03-11T14:05:20.736608Z"
    }

What am I trying to do?
Fetch the value of ‘createTime’ and value for ‘id’ field from the response and alert it.

NOTE: This is relatively easy for any other REST API. But,firestore populates the response inside the ‘documents’ array. Hence, I don’t know how to access it