Metric Extension SQL usage for SQL with semi-colon terminated.

Hello,

I would like to create a metric extension that can show the number of stale statistics in my database.

How do I use below SQL into metric extension SQL Query because the requirement is SQL statements should not be semi-colon terminated.

I read in Oracle Notes that we need to use out parameter position/type but the instruction is unclear.

declare

    m_objects   dbms_stats.ObjectTab;

begin

    dbms_stats.gather_database_stats(

        options => 'LIST STALE',

        objlist => m_objects

    );

    dbms_output.put_line(m_objects.count);

end;

/

Please advise.