user mapping options question

Hello,

I’m using dblink package to execute queries between two postgresql
databases.

Access definitions for the dblink are created using foreign data wrapper,
server and user mappings.

When I set user and password as options then postgres saves these parameters
in four system tables (table pg_user_mapping, view pg_user_mappings,
information_schema: _pg_user_mapping and user_mapping_options) and all
these tables store un-encrypted password.

Is there a way to create user mappings using encrypted passwords or store
the password encrypted in system tables?

Thanks,
Sergey