help in an ongoing embedded project -- 3

A keyboard is connected to the usb host of an STM32F4Discovery board and the same MCU connects to the PC as a USB HID device through another port. I am able to send all keys data to the PC via this MCU. I want to receive multimedia commands from keyboard for example function key + F1 etc; change these commands and forward to PC. I am using STM32CubeIDE and A keyboard with function key. I will share the working code and you can also check remotely on my PC.