I have used a note editor before called Collate. I actually bought a lifetime licence for it, and I enjoyed using it while I had it. Unfortunately, the author stopped supporting the project.
One of the features I really liked was the outline mode.
Is it possible to develop a plugin to render such a view? The format of the outline in markdown is the following structure
--- title: April - June 2018 tags:  type: outline created: '2018-03-28T18:43:56.999Z' modified: '2018-03-29T17:32:26.587Z' outline: id: t2r2mwyug8d title: Home children: - id: 9u90ojnug4l title: Product screencasts children: - id: n1hff9rbgcs title: What has worked? children: - id: bz53cdmuszg title: Product demos on Zoom children: - id: jaj0zx3ke9 title: Setup org structure on teams children:  completed: false - id: 44o4k48ehse title: Wak through setup process and use cases of each step. children:  completed: false - id: asv44l7jz9 title: Discuss the scenario of when each report is useful children:  completed: false - id: 9ksdz4cr568 title: Walked through answering the questions live children:  completed: false - id: bydr4n907b9 title: Show report summary email children:  completed: false completed: false