Assign a type to JSONField in Django

Question

I'm using a property of type JSONField in my model:

from django.db import models

class MyClass(models.Model):
  variables = models.JSONField()

I want to avoid as much as possible using strings to access variables properties, is there any way to specify the type of variables, so that I can use obj.variables.prop_name rather than obj.variables['prop_name']?