How to apply MarshalAs Attribute to return value of a property in managed C++

Hi,
I can apply a MarshalAs attribute to a return value of a property like so:

public decimal Foo {    
 [return: MarshalAs(UnmanagedType.Currency)]    
get {        return this.foo;    }    
[param: MarshalAs(UnmanagedType.Currency)]    
set {        this.foo = value;    }
}
 
How would I do the same in managed C++?
property RetClass^ Foo{	
 RetClass^ get() {
  return gcnew RetClass(); 
 }
}

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