Special Characters in hist title

Does anybody know how to include polish characters (ą, ę, ń, ó) in histogram title and name ?
Title and name are char strings and they are coded in ASCII I suppose. Is it possible to use UTF-8?

   auto h = new TH1D("h","", 10,0,1);
    TMathText l;
    l.DrawMathText(0.4, 1.1, "\\hbox{( ą, ę, ń, ó)}");