Uncheck/check all for checklists

I use Outline frequently to make checklists, like for travel. Every time I travel again I have to reset the checklist, but currently that requires me to uncheck every box on my list.

I would love to be able to do the equivalent of "uncheck all" with a single click or tap. I'm not a UX expert, but I'm picturing something like a clickable icon or word that appears on hover above each list to both uncheck or check all boxes in that list. (A bonus would be if it could be at the top of each list _indentation_, so that you could check/uncheck all items at that indentation level and below, but not affect any items at lesser indentation levels.)

Let me know if a visual would help.