Well, it's easy to implement and simple to understand. You could add those into the subjective, overall score.

Where are you writing the ⭐⭐⭐⭐⭐ nostr:npub1wf4pufsucer5va8g9p0rj5dnhvfeh6d8w0g6eayaep5dhps6rsgs43dgh9 
In a label? I'm assuming that zapstore will let us rate repos.