How to get available variable names for in my_config.h

Hello, noob here, great project, thanks for al this work and open sourcing it.
So I’ve already got the wifi settings configured, and this seems to work.

Now I’d like to have the number of leds and the ledpin baked in on the image.
Does anyone know the variable names, or is there a standard way of looking them up?

I did a search on the code, but i’m not sure you can just use those variables you find here and there… I’m not a programmer so.

Commenting for the future:
Look in const.h for variables.

for me this did the trick:

#define LEDPIN 4