Is it possible to add attributes to a property of dynamic object runtime?

I want to add an attribute to property of a dynamic object/expando object runtime, is it possible?

What I would like to do is:

dynamic myExpando = new ExpandoObject();
myExpando.SomeProp = "string";
myExpando.AddAttribute("SomeProp", new MyAttribute());

Is it possible to do that in one way or another?