Visual coaching timeline per client with phases and progress

As a coach, I want to be able to create a visual timeline for each client that divides the entire duration of a subscription (e.g., 6 or 12 months) into phases. Think of a cut phase of 3-4 months, followed by a refeed, a build-up phase, and so on. The coach can create phases, name them, set a start and end date, and make adjustments along the way. Both the coach and the client can view the timeline - the client sees immediately where they currently stand in the process. This gives the coach an overview of all clients without having to memorize everything, and gives the client confidence because a clear plan is visible. Ideally displayed on a tablet in the coaching environment and visible in the client portal or the app.