Standardized nix eval & build triggering protocol

Hi guys I’m wondering if there is a standardized protocol with which for a given reference to a package in a flake at a specific commit i can ask a remote nix eval & build server: if it has already evaluated it if not, to start evaluating it (and building resulting derivations) get the progress of the evaluation & the derivations being built get the result of the evaluation (usually just a store path, but could also be JSON, or a string, without any derivations involved) so for example to ge...