Are you looking to (like a home NAS or media server) on your current Mac, or were you checking for legacy compatibility ?
With version 5.7.1, Apple officially completed a radical shift in philosophy. They moved several core services directly into the standard macOS (High Sierra and later), meaning you no longer needed the $20 "Server" app to run them. macOS Server 5.7.1
Today, if you want to turn a Mac into a server, the "helpful" reality is that you likely already have the tools you need—like File Sharing and Content Caching—pre-installed in your standard macOS. Are you looking to (like a home NAS