Pg-restore Only Privileges/ACL?

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Is there a way to restore only the privileges/ACL of a relation or
whole database?

Often I've restored most of a database when some roles were missing.
Usually this produces valid data and DDL except for some missing Grant
statements. It's easy enough to extract Grants from plain SQL, but
with the Pgdump format it's not obvious to me.

Dropping and restoring the whole database seems like overkill. Ideally
I'd expect an option like "--privileges-only" or "--acl-only" that can
also be isolated to one table with "--table".

On a related note, why does "--schema-only" include Grant statements
when restoring the entire structure but not when restoring only
certain table(s)?
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