I came across this when researching Nav support with Meta Box. If you bring in a menu component, let's take a Bootstrap 5 Mega Menu as an example, you can use the code to create a static menu. If you want it to integrate with WordPress Nav, you'll need to create a Nav Walker script.
What I am looking for is creating dynamic menus directly with Meta Box. That way, I could bring in the HTML for the Mega Menu. In other words, a CMT (Custom Menu Type).
Is there a tested and confirmed support for this workflow?