how to add an item to the LCD menu Ender 3v2

I would like to know how to add an item to the LCD menu ender 3v2.
I have tried it, but when I compile in Visual Studio Code I receive this message:
Marlin\src\lcd\extui\lib\creality_dwin\creality_dw in.cpp: In member function ‘int CrealityDWINClass::Get_Menu_Size(uint8_t)’:
Marlin\src\lcd\extui\lib\creality_dwin\creality_dw in.cpp:4159:14: error: ‘NEIGE_TOTAL’ was not declared in this scope
[.pio\build\STM32F103RET6_creality\src\src\lcd\extu i\lib\creality_dwin\creality_dwin.cpp.o] Error 1

This is a relative complex change as marlin is highly “optimized”.

You should take a look on the existing menu items that can be enabled optional to see what is required to add something properly.