How to annotate without saving to db?

Question

Django

It is necessary to make an annotation and various aggregation methods for data that I do not take from the database.
If I understood everything correctly, then in django annotate and aggegate are applied only to QuerySet objects.
Is there a way to apply these methods to a dictionary, for example? Am I missing something or will I have to create a bike that does the same thing, only for dictionaries?