STM32WB55 USB audio driver support

I am currently working on a project that requires to implement USB audio in and out feature on STM32WB55 for connecting to PC. 

Is there any reference project that has this driver available? i tried working on FP-AUD-BVLINKWB1 but found that it is only supporting USB audio out and i have no idea how to add audio in into this project. 

Thank you