Thread: using jpacakge to create proper deb file from a jar

Hello. I am a newbie who is trying to create a game app deb file from a jar file .
I use jpackage because I want to bundle java with the app

Jpackage --input-dir <patjh to jar> --name Mygame --input-class Main.jar --type deb --main-jar Mygame.jar --install-dir /usr/bin/ --linux-menu-group "Game;"

This gives an install in /usr/bin/Mygame
but nothing in /usr/games which is where it should go

I was able to generate a Mygame.deb for an unbundled version of Mygame.jar using a template.
which installs into /usr/games and /usr/share
as well as /usr/share/applications

and the unbundled deb populates menu entries as above.
How can I get jpackage to respect these entries?
I am working on Ubuntu.
Sorry if this question is not appropriate.