I guess if someone knew how to program it that way, it might be possible, but it's not possible with Lesson as it is now. What are the advantages you see of having the pages in the Navigation block?
Lesson
Listing lesson's content page titles in Navigation menu
Гэтае абмеркаваньне было заблакавана, таму вы болей ня можаце адказваць на яго.