The example above is a typewriter. However you can make anything you want. Maybe just a rainbow title or some arrows pointing to your server name and blinking. You can give them a quick notification of their Faction power,... anything you want :)
This example shows that the subtitle can still...
Heya! I have a req! Pls null the AirBar resource by Mvdw, i have one but its blocked :(..
Here's the SpigotMC Link
https://www.spigotmc.org/resources/airbar.16649/