How to assign task a specific user

Hello community!

I would like to know if it is possible to assign a task to a specific user instead of an actor or to a user that is not defined in the actor, it is known that we can assign a group within the actor and all the people who are in that group can take the task, but if the user is not in that group within the actor is it possible to be assigned the task?

Actually I use Bonita Studio 7.5.4 and Server in the same version.