How to create User via API method with certain User's Country parameter?

Our case:
User can sign up via Web page -- it's implemented via Adapty API (https://docs.adapty.io/docs/server-side-api-specs#create-a-user) used on our backend.

Problem:
Users created via Adapty API from backend server are signed up with 'USA' Country, which has significant impact on our analytics.

Possible solution:
As we understand, reason of such behaviour is - Adapty API uses server's IP (USA origin) which make request to create user to set User's Country.
Is it possible to allow set user IP/Country in Adapty API Create User method as an optional parameter?