{
  "LambdaFunctionConfigurations": [
    {
      "LambdaFunctionArn": {
        "Fn::Join": [":", [
            "arn:aws:lambda",
            { "Ref": "AWS::Region" },
            { "Ref": "AWS::AccountId" },
            "function:my-lambda"
          ]
        ],
        "Events": ["s3:ObjectCreated:*"]
      }
    }
  ]
}