AddHttpClient, ConfigureHttpClient for client services. After moving API to external project

[engsky]

I know that there is no need to separate API because Oqtane framework structure is very strong, but my work require that separation. So How to use AddHttpClient during registering services from external Assemblies?
For examlpe if I separate the api to separated project (moving controllers, repositories, and Dbcontext from the Oqtane. Server to external Api project) so that inside startup class of Oqtane.Server I used AddHttpClient to initialize the BaseAddress with API address for Oqtane. Client services (i.e. services. AddHttpClient <IInterfaceClass, ImplementClass>().ConfigureHttpClient(c=> {c. BaseAddress = new Uri(apiUrlstring)});) ). so how can use that for services from external asseblies? Or what / where modifications should be done to make this cofcient work.

Thank you in advance.