USB HID keyboard stm32f103 - CubeMX

[MRusu.1]

I want to make a usb hid keyboard stm32. it possible in addition to the 6 keys that I transmit to add another byte in which to contain a variable that can be read by the application on the computer? Ex: | 0 - Key modifier | 1 | key1 | key2 | key3 | key4 | key5 | key6 | custom byte |.

And from the computer was sent to the keyboard information about lighting / (ex light level of rgb LEDs)