Access Nth element from an array (nested, or otherwise)

I’m having problems trying to access Nth element of an array within a bigger JSON object returned by a Zap.

For context, I’m using Salesforce API Request (Beta), and calling the composite endpoint, which allows me to call different endpoints within Salesforce subsequently.

The Salesforce Zap returns this:
 

Where data is a child of “response”, and here’s how it would look as a JSON:

{
  "response": {
    "status": 200,
    "headers": {},
    "data": {
      "compositeResponse": [
        {
          "body": {
            "id": "701PP00000rOSfnYAG",
            "success": true,
            "errors": []
          },
          "httpHeaders": {
            "Location": "/services/data/v62.0/sobjects/Campaign/701PP00000rOSfnYAG"
          },
          "httpStatusCode": 201,
          "referenceId": "newCamp"
        },
        {
          "body": {
            "attributes": {
              "type": "Campaign",
              "url": "/services/data/v62.0/sobjects/Campaign/701PP00000rOSfnYAG"
            },
            "Id": "701PP00000rOSfnYAG",
            "IsDeleted": false,
            "Name": "Test Webinar"
          },
          "httpHeaders": {
            "Last-Modified": "Mon, 23 Jun 2025 12:57:06 GMT"
          },
          "httpStatusCode": 200,
          "referenceId": "campDetails"
        }
      ]
    }
  }
}

In subsequent Zaps, I am trying to use field mapping to reference specific keys from each element under the array in “compositeResponse”

I have tried

{{_GEN_1750679257710__response__data__compositeResponse[0]__body__success}}

{{_GEN_1750679257710__response__data__compositeResponse__0__body__success}}

And different variations of that, also tried dot notation, but it’s not picking them up at all.

The only one that works is {{_GEN_1750679257710__response__data__compositeResponse[]body__XXX}}, but it’s not suitable for my case because it apparently aggregates those key-value pairs across all elements in the array in a comma-separated string.

I could probably fix this by using a Code step or otherwise, but I want to figure this out as it’s much simpler and straightforward than having to add another step.

Thank you for your help!