C# GRPC configure dynamic services mapping

What should I do to map all services dynamically in my grpc servicehost registration, instead of just mapping them one by one and editing this pieace of code everytime I add new service?

I've managed to get all types in assembly that are in GrpcServices and has my custom attribue using this:

public IEnumerable<Type> FindServiceInterfaces()
        {
            string definedIn = typeof(GrpcServiceAttribute).Assembly.GetName().Name;
            Assembly assembly = AppDomain.CurrentDomain.GetAssemblies().FirstOrDefault(x => x.GetName().Name.Equals("GrpcServices"));
            foreach (Type type in assembly.GetTypes())
                if (type.GetCustomAttributes(typeof(GrpcServiceAttribute), true).Length > 0)
                    yield return type;
        }

But I don't know how to cast/instantiate those above types and use them as follow but in generic/dynamic way:

var serverHostBuilder = new HostBuilder()
                .ConfigureServices((hostContext, services) =>
                {
                    services.AddGrpcServer<ISimpleActionService, SimpleActionService>(new GrpcServerOptions { Url = "127.0.0.1", Port = 5000 });
                });

Desired solution: just iterate through all of the interfaces that has my given attribute, find class that implements this inteface IFoo -> Foo and add this -> services.AddGrpcServer<IFoo,Foo>(.....)

The only solution I found to instatiate those object is casting to already known type like this:

var desiredClass =   (DesiredClassType) Activator.CreateInstance(assemblyType)

which is clearly not a solution for me.