How to use C# extension methods with SmartFormat reflection syntax?

Is it possible to make the following example work with SmartFormat.NET?

void Main()
{
    Dictionary<string,string> ps = new Dictionary<string, string>();

    ps["Name"] = "Niels";

    Smart.Format("{Name.Foo} is my name", ps).Dump();   
}


public static class Extensions
{

    public static string Foo(this string bar)
    {
        return bar.ToUpper();
    }

}

This will return " is my name" in LinqPad.