Edit pg_hba.conf file using pgAdmin 4
No, pgAdmin cannot edit pg_hba.conf

Unfortunately, there is no mechanism by which pgAdmin can edit a pg_hba.conf file.  The reason why it's possible to edit postgresql.conf via pgAdmin is that the ALTER SYSTEM syntax is something that can be entered into a client interface.  Therefore, pgAdmin was able to "edit" postgresql.conf because it could send an ALTER SYSTEM query to the database.  No such syntax exists for editing access control.