Astra Theme with Elementor Pro

Dear Wordpress, Astra Theme or Elementor Pro experts,

I need to add an HTML (Widget) that will show in the nav menu (for mobile) within and at the bottom of the hamburger menu, so the HTML is hidden till the hamburger menu is clicked and expanded displaying after the last menu item.

If anyone can shine some light on the best way to do this hopefully using Elementor Pro functions.

Any help will be greatly appreciated!