\defaultfontfeatures[jetbrainsmono-thin] {Extension=.otf, UprightFont=JetBrainsMono-Thin, ItalicFont=JetBrainsMono-ThinItalic, BoldFont=JetBrainsMono-Regular, BoldItalicFont=JetBrainsMono-Italic, Contextuals=AlternateOff }