\defaultfontfeatures[scholax]
  {
  Extension = .otf ,
  SlantedFont = TeXGyreScholaX-Slanted,
  BoldSlantedFont = TeXGyreScholaX-BoldSlanted,
  BoldFont = TeXGyreScholaX-Bold,
  ItalicFont = TeXGyreScholaX-Italic,
  BoldItalicFont = TeXGyreScholaX-BoldItalic,
  UprightFont = TeXGyreScholaX-Regular,
  }