You can do this with several of the chips, though the general consensus tends to be that it isn’t really all that worth it
The implants are relatively difficult to write on once installed, and it would be difficult for someone to write to your implant without you knowing about it, certainly I’ve never heard of any unauthorized implant writing/reading
That said, I do keep my xSIID write protected
What do you plan to keep on the implant that you want to keep protected? That might help us recommend something specific for you
Do you have any other use cases other than just lockable user storage?