To controll Jivelite on a screen i ordered ATmega32U4 5 V/16 MHz Module and programmed (Arduino) it according to this website: Buttonbox
You can assign the rotary encoders to up and down, volume up / down, what ever you want. You can add multiple buttons and assign them to any keyboard letter/number. The raspberry will see it as an extra keyboard. It’s by far the easiest way to add Rotary encoders and buttons to your project.
Just sharing, maybe you can use it in a next project