Django - Permissions to proxy model

I create a proxy model from auth.Group model, that I want to apply permissions to it.

proxies.py

class InstitutionOwnerGroup(Group):

    # Gestores
    pk = 1

    is_superuser = False
    is_staff = False

    class Meta:
        proxy = True
        permissions = (
            ('can_manage_institutions', 'Gerencia Instituições'),
        )

data migration

# Generated by Django 2.1.1 on 2018-10-14 23:30

from django.db import migrations
from horsy.apps.accounts.proxies import InstitutionOwnerGroup


def create_owner_group(app, _schema):
    InstitutionOwnerGroup.objects.create(
        name="Gestores"
    )


class Migration(migrations.Migration):

    dependencies = [
        ('accounts', '0002_add_admin_user'),
    ]

    operations = [
        migrations.RunPython(create_owner_group)
    ]

Gestores model in admin panel:

The given permission can_manage_institutions isn't been applied to model in data migration.

How to apply a permission by using django permission system to a proxy model inherited from auth.Group ?

from Django - Permissions to proxy model