[Plugin Request] PerWorldJoinLeave & leave messages for each world!

Hi, aternos' team!

I want following plugin to be added.

Click here to see the plugin in SpigotMC overview page.

1. What doing this plugin?

'This plugin add JoinLeaveMessages, who can be seen only in the world who are now you, working for every PerWorld in the server.'

Is this plugin supports 1.13x???

'Yes, that plugins supports and 1.13x, too supporting and down versions, max to 1.7x'

Is this plugins is from "via external site"?

'No.'

I hope this plugin will be added, if is "no", please give me reason why.

Thanks