This makes a lot of sense to me and I agree with other commenters, that we kinda already do this as product managers. You give it structure and thus a great way to share it with stakeholders and team.
I usually use lean-ish roadmaps (now/next/later/never) to share with stakeholders, but this let’s me add a different level of detail and it seems to be easy to understand for stakeholders across the organization and also make sense to the team.
I feel like the task level would happen in Jira (or whichever issue tracker is used), but everything above that would live somewhere else. It needs to be easily accessible, but also not a pain to edit as these things are living documents.
Would you have any recommendations on tools to use?