DynamoDB stream filtering using userIdentity

Hello,

I’m tryng to use the event filtering for my dynamodb table based off of TTL expirations.

This is the page all about it,

But when I try and make this into a serverless config I get ‘unsupported function event’

functions:
  hello:
    handler: handler.hello
    events:
      - stream:
        type: dynamodb
        arn: arn:aws:dynamodb:eu-west-2:XXXXXX:table/mytable/stream/2024-03-26T15:38:22.233         
        filterPatterns:
          - userIdentity:
              type:
                - Service
              principalId:
                - dynamodb.amazonaws.com