I am able to see from_user and to_user for worklist access using below query.
select menu_name from fnd_menus fndm, fnd_grants fndg
where grantee_key = 'USER_B'
and fndg.menu_id in (1015915,1017383)
and fndg.menu_id = fndm.menu_id
and program_name = 'PROXY'
and start_date <= sysdate
and (end_date is null OR end_date >= sysdate);
I need to know what type of acces is provided like requisition approval or expense approval, etc.