SV Designer - How to import message where response is JSON Array?

I am trying to setup a new Data Rule with the response shown below, but the message import is failing apparently due to my use of a JSON array for the response?! How do I setup a response which is a JSON array?

[
  {
    "effectiveDate": "2020-06-14",
    "deprecationDate": null
  },
  {
    "effectiveDate": "2020-06-14",
    "deprecationDate": null
  }]

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