So it turns out that Drew Adams wrote something very useful already...
probably I will propose some additions to his package here

On Sun, 23 May 2021 at 11:32, Eli Zaretskii <eliz@gnu.org> wrote:

> > From: dalanicolai <dalanicolai@gmail.com>
> > Date: Sun, 23 May 2021 10:56:17 +0200
> > Cc: emacs-devel@gnu.org
> >
> > So info-apropos searches all info-files on the system.
> > It would be handy to have a variant that searches only Emacs related
> info files
> > (or let you select a subset, like Info-occur does. But then info-occur
> additionally allows for narrowing further
> > on context)
>
> Would you like to propose a change to info-apropos along these lines?
>