AWS Lambda S3 Bucket Notification via CloudFormation

I'm trying to create a Lambda notification via CloudFormation but getting an error about the ARN format being incorrect.

Either my CloudFormation is wrong or it doesn't support the Lambda preview yet.

{
  "AWSTemplateFormatVersion": "2010-09-09",
  "Parameters": {
    "LambdaArn": {
      "Type": "String",
      "Default": "arn:aws:lambda:{some-region}:{some-account-id}:function:{some-fn-name}"
    }
  },
  "Resources": {
    "EventArchive": {
      "Type": "AWS::S3::Bucket",
      "Properties": {
        "NotificationConfiguration": {
          "TopicConfigurations": [
            {
              "Event": "s3:ObjectCreated:Put",
              "Topic": {
                "Ref": "LambdaArn"
              }
            }
          ]
        }
      }
    }
  }
}

But when I push up this CloudFormation I get the message:

The ARN is not well formed

Does anyone have idea as to what this means? I know the example above has been modified so not to use my actual ARN, but in my actual code I've copied the ARN directly from the GUI.

Also, interestingly I was able to create the notification via the AWS console, and so I just assume that AWS CloudFormation doesn't yet support this feature (even though that's not quite clear I don't think when reading the documentation).