The way it has the hole in the nut part that snapped off, makes me think it’s part of the fuel screw. That hole is for safety wire so the screw doesn’t turn/tamper evident. If it’s the smoke screw then the IP will need to come off and the old broken off piece will need to be removed via an EZ out/thread extractor and replaced. Not something easily done at home. If it’s just a bleeder then you can remove the same way and replace.