docs: def run(self, task, **kwargs):
          """
          This is a utility method to call a task from within a task. For instance:
  
              def grouped_tasks(task):
                  task.run(my_first_task)
                  task.run(my_second_task)
  
              nornir.run(grouped_tasks)
  
          This method will ensure the subtask is run only for the host in the current thread.
          """
          if not self.host or not self.nornir:
              msg = (
                  "You have to call this after setting host and nornir attributes. ",
                  "You probably called this from outside a nested task",
              )
              raise Exception(msg)
  
          if "severity_level" not in kwargs:
              kwargs["severity_level"] = self.severity_level
          task = Task(task, **kwargs)
          r = task.start(self.host, self.nornir)
          self.results.append(r[0] if len(r) == 1 else r)
  
          if r.failed:
              # Without this we will keep running the grouped task
              raise NornirSubTaskError(task=task, result=r)
  
          return r