How can I set specific stylistic sets of a font (
ss03, but not
ss02) with fontspec and LuaLaTeX? For instance, with the FiraCode font.
This question is not a duplicate of How to replace a letter?, and the answer https://tex.stackexchange.com/a/447692/213962 targets a different problem: I just need to enable some features, not find and replace their symbols with another.
How can one achieve the same with XeLaTeX?