SQL> declare
  2    type a_a_r is table of varchar2(2000) index by varchar2(2000);
  3    
  4    test_table  a_a_r;
  5  begin
  6    test_table('Indexed by varchar2') := 'Works just fine';
  7    
  8    dbms_output.put_line(test_table('Indexed by varchar2'));
  9  end;
 10  /
Works just fine

PL/SQL procedure successfully completed.

  begin
  package.proc(
                tab_array => package.tab('asdfd' , 'adsdfa);
               );
end  ;
did  not  know  about  the  edit  option  earlier

        begin
           pack.proc(
                  tab_array => pack.tab('one','two','three')
                 );
       end  ;