If you are running a server (a fork of Paper), this feature is built-in. You can enable it by modifying your configuration file: Open your purpur.yml file.
For standard users, this effect is typically achieved through a Resource Pack distributed by the server (Server Resource Pack) or by using a plugin like GlintColorizer or CustomEnchants that allows for glint overrides. Alternate Enchantment Glint (less obtrusive)
The (often labeled as "less obtrusive") is a community-created visual modification for Minecraft servers, specifically designed for use with the Paper server software and its derivative, Purpur . If you are running a server (a fork