List custom measure field mappings for an account

{
  "items": [
    {
      "id": "convinsights_mapping_01m31967b7em08vh1pqgbam3mj",
      "name": "LeadScore",
      "description": "Lead quality score derived from sentiment analysis",
      "entityMetadata": {
        "intelligenceOperator": {
          "operatorId": "intelligence_operator_01kcgy1ew0e9x8re6jq542zt8b",
          "operatorName": "Sentiment Analysis",
          "field": "leadScore"
        }
      },
      "createdAt": "2026-08-13T14:30:00Z",
      "updatedAt": "2026-09-30T10:00:00Z"
    }
  ],
  "meta": {
    "key": "items",
    "pageSize": 20,
    "previousToken": "eyJwYWdlIjowLCJxdWVyeSI6ImJvb2tzIn0=",
    "nextToken": "eyJwYWdlIjoyLCJxdWVyeSI6ImJvb2tzIn0="
  }
}