Plugin Tutorial Entity Framework Navigation Properties

"One other thing to note is that we do not have navigation properties (relational properties), and I'll cover those in more detail later."

from this tutorial https://docs.nopcommerce.com/developer/plugins/plugin-with-data-access.html

I could not find where it id covered in more detail later. It seems to not be covered at all?

Did you check in parent class (BaseEntity)?

As it says futher down - you can not use Navigation Properties in a plugin to access the existing data structures

"In custom context classes we cannot reference previously existing entities because those types are already associated to another object context. That is also why we do not have complex navigation properties in our tracking record"