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I got your idea, but please let me clarify why did we add Premium Addons for Elementor as a separate admin menu item:
Premium Addons PRO is an extensions for Premium Addons for Elementor (Free), you can notice that the PRO version adds more than one sub menu items to Premium Addons for Elementor ( White Labeling, License, PRO widgets Settings..)
Other plugins for Elementor (Element Pack) doesn’t have a free version that is extended when you purchase the PRO version.
On the other hand, adding the sub menus as tabs will much increase the code complexity.