DBMS_SCHEDULER - Question about calling programs from chain steps

 I'm new to using the DBMS_SCHEDULER so I'm unaware if this is actually possible.  I want to call a program (which references a procedure) from a chain step with an argument, but it's not clear if I can specify an argument within the chain step.  Here's an example of what I'm trying to accomplish:

BEGIN

    

    dbms_scheduler.create_program(

    program_name => 'TEST_PROG',

    program_action => 'A_PACKAGE.DUMMY',

    program_type => 'STORED_PROCEDURE',

    number_of_arguments => 1,

    enabled => FALSE);

   

   DBMS_SCHEDULER.DEFINE_PROGRAM_ARGUMENT (

   program_name            => 'TEST_PROG',

   argument_position       => 1,

   argument_name           => 'ARG1',

   argument_type           => 'VARCHAR2',

   default_value           => 'X');