CurseForge

What can be done?

At the moment, you can do following:

Add new variables to MOTD

How?

You can use the variables API. You need to listen for VariablesRegisterEvent and then call

@EventHandler
public void onVariablesRegister(VariablesRegisterEvent event){
    Variable myVariable; // you need to create variable. Check code on github to see how variables work.
    event.registerVariable("myvar", myVariable);
}