How do I use the "author" property of the "Add Comment" API?

[David Dietrich]

I am trying to send comments to Jira from ServiceNow using the "Add Comment" API described here: https://docs.atlassian.com/software/jira/docs/api/REST/8.10.0/#api/2/issue-addComment. The "Schema" shows the comment API has an "author" property:

"author": {
  "$ref": "#/definitions/user"
}

How can I use this to set the comment author?

There is a very old thread which states this is impossible: https://community.atlassian.com/t5/Answers-Developer-Questions/Jira-REST-API-create-a-comment-as-another-user/qaq-p/481139.

Here is a more recent thread from three years ago which states the "author" field of the Add comment resource is not used by Jira to set the comment author: https://community.atlassian.com/t5/Jira-Core-questions/How-to-change-the-name-of-commentator-via-API/qaq-p/288157.

Is this still the case? If so, why does the "author" property exist?

For the record, this is the definition of the "author" property given in the Jira API docs:

"user": {
    "title": "User",
    "type": "object",
    "properties": {
      "name": {
        "type": "string"
      },
    "key": {
      "type": "string"
    },
    "emailAddress": {
      "type": "string"
    },
    "avatarUrls": {
      "type": "object",
      "patternProperties": {
        ".+": {
          "type": "string"
        }
      },
      "additionalProperties": false
    },
      "displayName": {
        "type": "string"
      },
      "active": {
        "type": "boolean"
      },
      "timeZone": {
        "type": "string"
      }
    },
    "additionalProperties": false,
    "required": [
      "active"
    ]
  }
}