如何在CloudFormation中创建安全组时指定我的IP？

Resources:
  MySecurityGroup:
    Type: AWS::EC2::SecurityGroup
    Properties:
      GroupDescription: My Security Group
      SecurityGroupIngress:
        - IpProtocol: tcp
          FromPort: 22
          ToPort: 22
          CidrIp: !Ref MyIP

Parameters:
  MyIP:
    Type: String
    Description: Your IP address
    Default: 0.0.0.0/0
    AllowedPattern: (\d{1,3})\.(\d{1,3})\.(\d{1,3})\.(\d{1,3})\/(\d{1,2})
    ConstraintDescription: Must be a valid IP CIDR range of the form x.x.x.x/x.

aws cloudformation create-stack --stack-name MyStack --template-body file://template.yaml --parameters ParameterKey=MyIP,ParameterValue=192.168.0.1/32