# models.py
from django.db import models

class MyModel(models.Model):
    data_field = models.JSONField()

# views.py
from django.http import JsonResponse
from .models import MyModel

def get_json_data(request):
    queryset = MyModel.objects.values('data_field')
    data_list = list(queryset)
    return JsonResponse(data_list, safe=False)

# urls.py
from django.urls import path
from .views import get_json_data

urlpatterns = [
    path('get_json_data/', get_json_data, name='get_json_data'),
]

# settings.py
INSTALLED_APPS = [
    # ...
    'your_app_name',
    # ...
]

# manage.py
python manage.py makemigrations
python manage.py migrate

# your_app_name/fixtures/initial_data.json
[
    {
        "model": "your_app_name.mymodel",
        "pk": 1,
        "fields": {
            "data_field": [1, 2, 3]
        }
    },
    # Add more data as needed
]

# Terminal
python manage.py loaddata initial_data

# your_mysql_database_name/settings.py
DATABASES = {
    'default': {
        'ENGINE': 'django.db.backends.mysql',
        'NAME': 'your_mysql_database_name',
        'USER': 'your_mysql_user',
        'PASSWORD': 'your_mysql_password',
        'HOST': 'localhost',
        'PORT': '3306',
    }
}

# your_app_name/admin.py
from django.contrib import admin
from .models import MyModel

admin.site.register(MyModel)

# Terminal
python manage.py runserver

Access the endpoint at http://localhost:8000/get_json_data/

```