new_contents: from django.contrib import admin
  from django.contrib.auth.models import Permission
  from django.contrib.contenttypes.models import ContentType
  
  
  class PermissionAdmin(admin.ModelAdmin):
      list_filter = ['content_type__app_label']
  
  
  class ContentTypeAdmin(admin.ModelAdmin):
      list_display = ['id', 'app_label', 'model']
      list_filter = ['app_label']
  
  
  admin.site.register(Permission, PermissionAdmin)
  admin.site.register(ContentType, ContentTypeAdmin)
  
subject: Add ContentType and Permission to admin