Just randomly throwing ideas, brainstorm style:
A chip that signals your cybersurgeon that the carrier died, and at which location, so they can extract the chrome from your corpse? Or even just beep an ally so they can perhaps avenge you/join the fight in time
A 'vitals reader' that sends your health info to a monitor/another chip.
A 'suicide cerebral cortex' that doesn't just kill you, but makes a huge explosion too. useful for people with sensitive paydata and loose ends.
'longblade' versions of nailz, like blades that come out of your arm (like the cyberpuunk 2027 trailer'
GUN ARMS! Pistol calibre only I suspect
Stunskin: obvoius as fuck (you can see like, wires just underneath their skin) and it does an electrical shock similar to a certain combat vehicle in the game, but perhaps only on people who grapple you, or frisk you, for example. Heck you could even use it to electrify your bladed/metallic weapons? that'd be cool!
Really pushing out the boat now:
SIC hackers (maybe not installable chrome, but like a physical setup thing, like a signal amplifier) that can steal keys over a period of hours
Anti-fall legs/spine. reinforced skeletal setructure plus some kind of 'lock up' ability to survive falls, with suitably cool and dramatic crater when you land.
NANOMACHINES SON (nanos that harden to trauma, effectively counting as armour)
EYE/FINGER GRENADES! Pull your eye.limb out, use it to maybe break out of prison, or to cause a small explosion!