Assign new resources/methods to an existent APIGW

I’m using the Serverless Framework to deploy some lambdas and populate the endpoints/paths in a private existent API gateway in AWS. But I need to populate the same paths/methods in a public APIGW, because this public apigw send the requisitions to the private one. Proxy isn’t an option now, because we have ACLs that filter the paths to allow access.
There is a way in SF to declare the apigw, paths, cors, etc to be deployed without a lambda function attached to it?