Is it possible to make a Postman Mock Server to be accessible to an external real service outside of the Postman? App

We have the real and well-developed eCommerce application. We know that Postma it is a good tool when you have the set of requests in the Postman collections which could be send either to a real service (which all developers use Postman for) or to Mock Server created in Postman. But we have a very different problem now: we need to send the request from the real application to a Mock Servers created in Postman to test our new services which should send GET and POST request to the server which we will mock, because the real server is in the development by another team. We will much appreciate your answers. Thank you.