Add "teachers notes" feature on lessons

[Piyopiyo-Kitsune]

Is your feature request related to a problem? Please describe

Currently on Learn WordPress we have created a custom post type called "lesson plans" which take a topic which could be in a lesson and gives notes for teaching. While lesson plans have been used in the past by teachers in classroom and meetup scenarios, this separate post type has left the site riddled with another area with duplicative information.

This will help us provide teaching materials to those who need it in a more streamlined way.

Describe the solution you'd like

A setting within a lesson that can be toggled on to show information that would be in a lesson plan within the lesson itself.

Describe alternatives you've considered

We began with the alternative, which is a lesson plan.

Additional context

If we take this Udemy course's lesson page as an example, they have various tabs within the lesson where various features are stored within the lesson.

I made a super quick and simple mockup with the potential new field in the editor and in the lesson below