API Gateway - Integration request - how to enable Caching?

Dear Serverless, I have API Gateway Proxy configuration in serverless.yml. Stage caching is successfully turned on. But I cannot enable caching on Integration Request -> Url Path Parameters -> caching in serverless.yml file. Here is my config (a part):

resources:
  Resources:
    ProxyResource:
      Type: AWS::ApiGateway::Resource
      Properties:
        ParentId: !GetAtt ApiGatewayRestApi.RootResourceId
        RestApiId: !Ref ApiGatewayRestApi
        PathPart: '{proxy+}'
    RootMethod:
      Type: AWS::ApiGateway::Method
      Properties:
        ResourceId: !GetAtt ApiGatewayRestApi.RootResourceId
        RestApiId: !Ref ApiGatewayRestApi
        AuthorizationType: NONE
        HttpMethod: ANY
        Integration:
          Type: HTTP_PROXY
          IntegrationHttpMethod: ANY
          Uri: ${self:custom.backendUrls.${self:provider.stage}}
          PassthroughBehavior: WHEN_NO_MATCH
    ProxyMethod:
      Type: AWS::ApiGateway::Method
      Properties:
        ResourceId: !Ref ProxyResource
        RestApiId: !Ref ApiGatewayRestApi
        AuthorizationType: NONE
        HttpMethod: ANY
        RequestParameters:
          method.request.path.proxy: true
        Integration:
          Type: HTTP_PROXY
          IntegrationHttpMethod: ANY
          Uri: ${self:custom.backendUrls.${self:provider.stage}}/{proxy}
          PassthroughBehavior: WHEN_NO_MATCH
          RequestParameters:
            integration.request.path.proxy: 'method.request.path.proxy'
          CacheKeyParameters:
            - method.request.path.proxy

This Api Gateway is only proxy. Of course I can deploy it to AWS and enable the caching on Integration request manually, but would like have that fully automatic.
Thanks for having a look.

Hi, I also have the same problem, have you found a solution?
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