Nesting an already defined menu in a menu

Greetings,

Is it possible to nest a menu that has already been defined (say, in a
plugin) under another menu (say, PopUp)?

Something like:
amenu PopUp.&SomeMenu :nest-another-menu MenuThatAlreadyExists

I went through the docs as well as a bunch of plugins that deal with
menus and basically found nothing.

Thanks,
G.

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