AWS CloudFormation リソースのインポートを使用して、既存の S3 バケットで AWS Lambda の Amazon S3 通知設定を作成するにはどうすればよいですか?

AWSTemplateFormatVersion: 2010-09-09
Description: >-
  Sample template to illustrate use of importing existing S3 bucket as event source for Lambda function
Parameters:
  NotificationBucket:
    Type: String
    Description: S3 bucket which is used for Lambda event notification
Resources:
  S3NotificationLambdaFunction:
    Type: 'AWS::Lambda::Function'
    Properties:
      Code:
        ZipFile: !Join
          - |+

          - - import json
            - 'def lambda_handler(event,context):'
            - '    return ''Welcome... This is a test Lambda Function'''
      Handler: index.lambda_handler
      Role: !GetAtt LambdaIAMRole.Arn
      Runtime: python3.6
      Timeout: 5
  LambdaInvokePermission:
    Type: 'AWS::Lambda::Permission'
    Properties:
      FunctionName: !GetAtt S3NotificationLambdaFunction.Arn
      Action: 'lambda:InvokeFunction'
      Principal: s3.amazonaws.com
      SourceAccount: !Ref 'AWS::AccountId'
      SourceArn: !Sub 'arn:aws:s3:::${NotificationBucket}'
  LambdaIAMRole:
    Type: 'AWS::IAM::Role'
    Properties:
      AssumeRolePolicyDocument:
        Version: 2012-10-17
        Statement:
          - Effect: Allow
            Principal:
              Service:
                - lambda.amazonaws.com
            Action:
              - 'sts:AssumeRole'
      Path: /
      Policies:
        - PolicyName: root
          PolicyDocument:
            Version: 2012-10-17
            Statement:
              - Effect: Allow
                Action:
                  - 's3:GetBucketNotification'
                  - 's3:PutBucketNotification'
                Resource: !Sub 'arn:aws:s3:::${NotificationBucket}'
              - Effect: Allow
                Action:
                  - 'logs:CreateLogGroup'
                  - 'logs:CreateLogStream'
                  - 'logs:PutLogEvents'
                Resource: 'arn:aws:logs:*:*:*'

AWSTemplateFormatVersion: 2010-09-09
Description: >-
  Sample template to illustrate the use of importing an existing S3 bucket as an event source for a Lambda function
Parameters:
  NotificationBucket:
    Type: String
    Description: S3 bucket which is used for Lambda event notification
Resources:
<Excluded the resources as the below resource is addition to above resources provided in step(a)>
   NotificationBucket:
      Type: 'AWS::S3::Bucket'
      DeletionPolicy: Retain            
      Properties:
        BucketName: myenv-bucket          #Bucket name to import

AWSTemplateFormatVersion: 2010-09-09
Description: >-
  Sample template to illustrate use of importing existing S3 bucket as event source for
  Lambda function
Parameters:
  NotificationBucket:
    Type: String
    Description: S3 bucket which is used for Lambda event notification
Resources:
<Excluded the resources as the below resource is addition to above resources provided in step(a)>
    NotificationBucket:
      Type: 'AWS::S3::Bucket'
      DeletionPolicy: Retain            
      Properties:
        BucketName: myenv-bucket
        NotificationConfiguration:
          LambdaConfigurations:
              - Event: 's3:ObjectCreated:Put'
                Function: !GetAtt S3NotificationLambdaFunction.Arn
              - Event: 's3:ObjectRemoved:*'
                Function: !GetAtt S3NotificationLambdaFunction.Arn