How can I access the 'Action' field in django-simple-history?

I’m using django-simple-history to record changes in my models. I cannot find a way to access the “Action” in history model.

DATE/TIME USER ACTION (in admin panel)

In templates:

{{ invoice.history_date }}
{{ invoice.history_user }}
invoice. ____ ? 

I have not found a working solution. I have tried : invoice.action, invoice.actions, invoice.history_action/s, etc and they don’t work. I want to show what exactly was changed.
An alternative to this is also welcomed.

That data is not stored in the history model. That information is stored in the admin’s LogEntry model. It’s a function of the admin app and not django-simple-history.