Allow extending model with an extra details of tasks

[adam-jarzebak]

Is there a way to easily extend a model, so that in admin I can for example sort by client_id etc?
I am trying at the moment to achieve with with:
TaskResult.add_to_class('task_creator', models.ForeignKey(ExtraTaskDetails, on_delete=models.CASCADE, null=True))

but it's tricky and requires manual management of migrations.