That's what library code, Objective C, object-oriented programming, the Java standard library, etc etc were supposed to do. To some extent, they all accomplished that goal a little.

To directly address your title, I'll finally get to see a quine in the nroff macro language, something which I believe does not currently exist, so LLMs can't dredge one up to entertain us. Or perhaps a proof of why such a quine isn't possible. Either way is fine.