Blazor MAUI: How to use .net api controller from blazor server app in MAUI desktop app?

I want to transfer our current Blazor Server app into a MAUI Blazor desktop app.

However, the Blazor app consits of some controller web-api endpoints which are started with the blazor server when running as Blazor server app.

Running:

app.MapControllers();

in the Program.cs file for the Blazor app startup.

How to maintain these controllers in a MAUI Application? As there is no "mapControllers" service or call which seem to provide the same web api endpoints as the Blazor up does?

Or asks differently, as this is a normal .net 6 Controller providing and endpoint. How can this be embedded into a MAUI app?

Any comment to point me in the right direction would be helpfull.

Thanks & Regads,
Lars