Please update the project to the latest version so that you can use the system for 1.19.3 and so on.

Works wonderfully on 1.19, but really needs support for 1.19.3. Sadly throws errors into the console when used on 1.19.3.

You write senssu that you can use it as a guideline, the plugin doesn't even have any commands

After a year or so of searching (and attempts on my own at creating my own framework), I have finally settled for this API which allows for easy developer access to multi line nametags on recent Minecraft versions. Best of all, it is clientside! Normally, entities are teleported and actually exist on the server, but with this solution a lot of the load is taken away. Not to mention, the API is generally easy to use and requires a very little amount of code to get it working. The old standard was MultiLineAPI, but, with no support for recent versions, this resource is certainly the future :)