Put Lambda Under Existing APIG Resource But Different Method

Serverless Framework
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1

In the APIG, my path is /users with GET method already created using Cloudformation. In my Serverless, i want to create a new POST method under it. How do i do it?

I already tried below but it does not work.

// function.yml
...
events:
  - http:
      path: /users
      method: post
...

// serverless.yml
restApiId: APIG rest id
restApiRootResourceId: APIG root id
   restApiResources: 
       /users: id of my /users

Serverless Error ---------------------------------------
 
  An error occurred: ApiGatewayResourceGeocode - Resource handler returned message: "Another resource with the same parent already has this name: users (Service: ApiGateway, Status Code: 409, Request ID: 9bb3ae3a-a124-4bac-9b70-529ecb88ce2b) (SDK Attempt Count: 1)" (RequestToken: 27dea297-edcb-e5c8-9a24-e3eedf5f2e24, HandlerErrorCode: AlreadyExists).
2

There is no direct way to do this. I used resources for this problem. Create the lambda without any triggers and use resources to create new method under existing APIG resource and add permission to lambda.