Well, things would go wrong if you created something like that when not everyone had that addon. You'd need to have the QG addons in the list of required addons in the mission for that to work, since then, anyone who didn't have QG wouldn't be able to start playing the mission. This question, however, is not asking how to create something from an "external" addon, but rather whether it would be possible to include an addon-based item within a mission so that there would be no external dependencies.