I do something like this in VSCode as well, Markdown todo lists:

  - [ ] Task 1

    - [ ] Task 1.1

      - [x] Task 1.1.1

    - [ ] Task 1.2

etc.

In particular, I break down yearly goals into quarterly, monthly, weekly and daily, each another node in the tree getting increasingly more specific.

It really helps understand the flow from the highest to the lowest levels of details. Only problem is if goals change midway, it's not propagating up the tree automatically. I just leave it like that though, not gonna manually fix that.