For your reference, Medbridge is one of the leading players in this market, for trainers creating prescribed programs for their clients/patients. The mobile app does everything you've created so far, but adds a governance and analytics layers for the trainer to specify sets and reps, track weights, and for the client to assess their rpe/comments/feedback.

Think of it similar to the Strong app, but aimed at trainers/PTs.

https://www.medbridge.com/care/home-exercise-program