How to add groups in subparser?

I would like to add groups in a subparser.

parser = argparse.ArgumentParser(description="A Pipeline.")
subparsers = parser.add_subparsers(
    help="Choose imagery source", dest="imagery_source"
)

animal_parser = subparsers.add_parser("animal")
group1_parser = animal_parser.add_argument_group("for_dog_config")
group1_parser.add_argument("--dog", type=str)

group2_parser = animal_parser.add_argument_group("for_cat_config")
group2_parser.add_argument("--cat", type=str)

args = parser.parse_args()
print(args)

run_pipeline animal --dog hello --cat world
Here is the output of namespace.

Namespace(cat='world', dog='hello', imagery_source='animal')

What I would like is that the cat and dog are in different namespaces or dictionaries respectively. Is it possible? Note: I know there are other answers using add_argument_group in ArgumentParser object, but I need to use subparsers = prser.add_subparsers here.

=========== Update ===========
This code block almost do what I need.

def get_arg(parser):
    args = parser.parse_args()
    args_groups = {}
    for group in parser._action_groups:
        group_dict = {a.dest: getattr(args, a.dest, None) for a in group._group_actions}
        args_groups.update({group.title: argparse.Namespace(**group_dict)})
    return args_groups

parser = argparse.ArgumentParser(description="A Pipeline.")
subparsers = parser.add_subparsers(
    help="Choose imagery source", dest="imagery_source"
)
group1_parser = parser.add_argument_group("for_dog_config")
group1_parser.add_argument("--dog", type=str)

group2_parser = parser.add_argument_group("for_cat_config")
group2_parser.add_argument("--cat", type=str)

args = get_arg(parser)
print(args)

Execute run_stereo_pipeline --dog hello --cat world The output is

{'positional arguments': Namespace(imagery_source=None), 'optional arguments': Namespace(help=None), 'for_dog_config': Namespace(dog='hello'), 'for_cat_config': Namespace(cat='world')}

As you can see, now I can do things like args["for_cat_config"] to get all arguments in the "for_cat_config" group. But in this approach, I can not specify animal source which is what I want in the question.