Subdags and Taskgroups Intefaces

[Pocoder]

I want to pass some data to subdags or taskgroups and from them to subsequent tasks. I have not found better way than create "input" and "output" tasks which explicitly use xcom push and pull (Do you know better solution?).
I think it would be great to unify subdags'/taskgroups' interfaces with tasks(taskflow api) and use XComArgs. What do you think?

[Pocoder]

For TaskGroups it can be done:

from airflow.decorators import task_group


@task_group
def simple_task_group(val):
    task_res = simple_task(val)
    return task_res