Drawing diagrams in outliner with Pencil and iPad Pro?

I’m looking for a way to write documents intermixed with drawings, which I would create with the Pencil on my iPad Pro. I just tried the free trial of Outliner on iOS and I don’t see this feature. I assume it’s not there but I want to check here in case I missed it.

Apple’s Pages lets me draw in the document but I miss the expandable/collapsible outlines.



Actually, that would be a nice feature request. I’d like that too.