PL/SQL to download .ldt for registering concurrent in request group

Can anybody provide an example of pl/sql block for downloading .ldt with fnd_request.submit_request?

I need ldt for assigning concurrent to request group.

Group name is 'System Administrator Reports', application short name='FND' I believe.

I tried so far:

DECLARE
  req_id   fnd_concurrent_requests.request_id%TYPE;
BEGIN
  fnd_global.apps_initialize(
    user_id => 0
    ,resp_id => <...>
    ,resp_appl_id => 1
    );

  req_id :=
    fnd_request.submit_request
        (application   => 'FND'
        ,program       => 'FNDLOAD'
        ,description   => NULL
        ,start_time    => NULL
        ,sub_request