wiremock to mock public backend response

I am testing on an app that is making calls to a public backend.

I want to use wiremock to mock reponses from the public backends.

I was looking at something like

1. the app makes a request to api.example.com which is forced through the wiremock proxy on localhost:<port>
2. wiremock matches the URL based on the rules I provide and returns a mock response

The only examples I could find map localhost requests to real backends or mock responses to localhost.