Why can’t we mark up the lesson manuals, like we can the scriptures and talks?

This app is great, don’t get me wrong, but it doesn’t make sense that we can highlight text and write notes up for almost everything except the lesson manuals. So when I’m preparing a lesson, I can mark up the related scriptures and talks, but I have to print out the lesson to highlight the parts I want to use and make notes on how I want to give the lesson. This seems like a simple, but much appreciated fix. I could prepare a lesson no matter where I am and give a lesson no matter what I accidentally leave at home. (I never leave my phone :)
Otherwise I LOVE this apple and the related LDS Tools app.

jnting about Gospel Library, v3.4.13