Get the tasks based on logged in User Role or Group

I have designed a process with Human tasks which is assigned to actor, actor mapped to Group and Group mapped to few roles.

In Bonita portal its working fine(Tasks are getting based on user group/role).

But the i am facing the issue while getting the tasks through REST API from Engine. Its not giving any tasks as no tasks are assigned to the user.

Thanks In Advance for your Great Time.

Thanks
Paparao

Do we have any REST api to pull all the applicable(based on group/role etc ) tasks of user?