This version of Grbl_Esp32.ino from Grbl_Esp32 CNC project allows to connect I2C OLED display (shows current coordinates and delta step value) and x-y joystick w\pushbutton (controls 2d-cnc table).
Simply connect I2C OLED and Joystick to ESP32 (see the pinout in the sketch) and use this file to update the functionality of classical Grbl-Esp32 CNC.