Quoting an email of mine:

Why not enhance groff man(7) to support a mode where _it_ will
spit out the "Name"/"NAME" section, and only that, _for_ you?

This would be as easy as checking for an option, say '-d EXTRACT=Name',
and having the package's "TH" and "SH" macro definitions divert
(literally, with the `di` request) everything _except_ the section of
interest to a diversion that is then never called/output.  (This is
similar to an m4 feature known as the "black hole diversion".)

...

I also of course have ideas for generalizing the feature, so that you
can request any (sub)section by name, and, with a bit more ambition,[4]
paragraph tags (`TP`) too.

So you could do things like:

nroff -man -d EXTRACT="RETURN VALUE" man3/bsearch.3

and:

nroff -man -d EXTRACT="OPTIONS/-b" man8/zic.8

...

[4] To really land the feature, we need automatic tag generation from
    input text (we don't want to make the man page author construct
    their own tags).  Another reason we want the construction to be
    automatic is to make the tags unique when multiple man pages are
    formatted in one run, as one might do when making a book of man
    pages.  Automatic tagging will also enable the slaying of two other
    ancient dragons.

    1.  deep internal links for PDF bookmarks
    2.  pod2man's `IX`-happy output; the widespread use of this
        nonstandard macro confuses way too many novice page authors, and
        bloats document size.

   Another feature we'll really want to do this right is improved string
   processing facilities.  That, too, is something that will pay
   dividends in several areas.  With a proper string iterator in the
   formatter (and a couple more conditional operators),[5] it will be
   possible to write a string library as a macro file, slimming down the
   formatter itself a little and making macro writers' lives easier.
   We're only two days into the month and this has already come up on
   the groff list.

   https://lists.gnu.org/archive/html/groff/2024-11/msg00002.html

[5] https://savannah.gnu.org/bugs/?62264