Step Functions - parellel steps

Trying to implement the same functionality: run state machine with two parallel steps. See the following example: https://github.com/aws-samples/lambda-refarch-imagerecognition

I came up with following code, but the steps Recognition and Thumbnails shoul be running in parallel:

stepFunctions:
  stateMachines:
    ImageProcStateMachine:
      name: ImageProcStateMachine
      role:
        Fn::GetAtt: ["StateMachineRole", "Arn"]
      definition:
        Comment: "Image Processing State Machine of the Amazon States Language using an AWS Lambda Function"
        StartAt: ExtractImageMetadata
        States:
          ExtractImageMetadata:
            Type: Task
            Resource:
              Fn::GetAtt: [ExtractImageMetadataFunction, Arn]
            Next: TransformMetadata
          TransformMetadata:
            Type: Task
            Resource:
              Fn::GetAtt: [TransformMetadataFunction, Arn]
            Next: StoreImageMetadata
          StoreImageMetadata:
            Type: Task
            Resource:
              Fn::GetAtt: [StoreImageMetadataFunction, Arn]
            Next: Rekognition
          Rekognition:
            Type: Task
            Resource:
              Fn::GetAtt: [RekognitionFunction, Arn]
            Next: GenerateThumbnail
          GenerateThumbnail:
            Type: Task
            Resource:
              Fn::GetAtt: [GenerateThumbnailFunction, Arn]
            End: true

Is there the way to implement parallel processing tasks feature with Serverless Framework?