.NetCore dependency injection and optional params on assembly scanning

Question

With autofac I'm to add a parameter to the constructor and even more, the parameter can be optional

//autofac
Builder
.RegisterAssemblyTypes(assemblies)
.Where(t => typeof(T).IsAssignableFrom(t))
.SingleInstance()
.AsSelf()
.WithParameter(new ResolvedParameter(
(pi, ctx) => pi.ParameterType == typeof(IMyService),
(pi, ctx) => ctx.ResolveOptional<IMyService>() ));

Could you help do this with the default MS dependency container and Scrutor?

 

What should I add here:

//MS Dependency Container
Builder
.Scan(s =>
s.FromAssemblies(assemblies)
.AddClasses(c => c.AssignableTo(typeof(T)))
.AsSelf()
.WithTransientLifetime() );

Thank you in advance for help and answer