There are exercises however you will need demostration and specific prescription. It would be non profesional to list execises and not been able to monitor the whole posture for the exercises. In addition you need selective strengthenig and stretching. As a rough explanation your back needs mostly strength while the chest mostly stretching only!!!!! However without testing what is doing what i cant list those. Exercise regimes must be taillored to the needs of the client or patient rather a cookbook which i dont apply as each is a specific unit with specific problems or concerns. Hence why i suggested physio or advance personal trainer to assess and apply those specific to each muscle that is needed and not the generic.
Dont get me wrong trying to guide but through a net you never will able to find The solution.
To tip you try and find for an NASM CES personal trainer or physio with those qualifications.