APIServer: How to make custom typed client accessible via the QerApiService

I've build the 'HelloWorld' custom method example with: IApiProviderFor<QER.CompositionApi.Portal.PortalApiProject>
End-point works: itshop.groot.net/.../helloworld: {"Message":"Hello world!"}
imx-api-ccc.tgz compiled and installed: node_modules\imx-api-ccc\TypedClient.d.ts

How can I make the typed client 'portal_helloworld' accessible via the QerApiService: await this.qerClient.client.portal_helloworld
(Property 'portal_helloworld_get' does not exist on type 'V2Client')

How and where do I incorporate/import the custom api?
projects\qer\src\lib\qer-api-client.service.ts
import { V2Client, Client, TypedClient } from 'imx-api-qer';

Thank you
Niels