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我在 CloudFormation 模板中描述了我的 AWS 资源并面临下一个问题 - 我使用 HTTPS 协议订阅了 SNS。使用该订阅，我将 CloudWatch 警报的 SNS 主题与 API Gateway 链接，后者将这些警报转发到 Slack webhook。在我的 CloudFormation 模板中，我已经描述了 API Gateway 元素（REST API、资源和方法）：

Resources:
  AlarmRestApi:
    Type: "AWS::ApiGateway::RestApi"
    Properties:
      Name: "sns-to-slack"
      Description: "REST API for forwarding CloudWatch alarms to Slack"

  SlackAlarmsResource:
    Type: "AWS::ApiGateway::Resource"
    Properties:
      RestApiId: !Ref "AlarmRestApi"
      ParentId: !GetAtt "AlarmRestApi.RootResourceId"
      PathPart: "slack-alarms"

  AlarmRestApiStage:
    Type: "AWS::ApiGateway::Stage"
    Properties:
      DeploymentId: !Ref "RestApiDeployment"
      RestApiId: !Ref "AlarmRestApi"
      StageName: "dev"
  ...

目前我描述了 SNS 主题和订阅，但我无法获取“SlackAlarmsResource”的 PathPart 属性以避免在订阅模板中对其进行硬编码。使用硬编码的资源值，它看起来：

CloudWatchAlarmsTopic:
    Type: AWS::SNS::Topic
    Properties:
      DisplayName: "cloudwatch-alarms"
      TopicName: "cloudwatch-alarms"

  CloudWatchAlarmsSubcscription:
    Type: "AWS::SNS::Subscription"
    Properties:
      TopicArn: !Ref "CloudWatchAlarmsTopic"
      Endpoint: !Sub "https://${AlarmRestApi}.execute-api.${AWS::Region}.amazonaws.com/${AlarmRestApiStage}/slack-alarms"
      Protocol: https
      RawMessageDelivery: true

如何在 SNS 订阅端点属性中获取 API Gateway 资源的 PathPart 值（“slack-alarms”）？

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