\defaultfontfeatures[MonaspaceXenon-Regular]
{
  Extension=.otf,
  UprightFont=MonaspaceXenon-Regular,
  ItalicFont=MonaspaceXenon-Italic,
  BoldFont=MonaspaceXenon-SemiBold,
  BoldItalicFont=MonaspaceXenon-SemiBoldItalic
}