Allow custom variable in Filament Settings to be accessed in Printer Settings

[CodeMonkeyX]

I would like to be able to access global variables defined in "Filament Settings -> Custom G-Code" in "Printer Settings -> Custom G-Code"

I am I trying to define a Chamber Temperature that is defined in the Filament Settings. What I did was add a global variable in the Filament Settings Start G-Code. But it looks like that gets parsed after the Printer Settings Start G-Code so the Printer Settings does not see it for the Print_Start macros.

Maybe a new text box in the "Filament Settings -> Custom G-Code" page that just says "Global Config Variables" then we can add any custom G-Code variables we might need for custom macros, that might not be available in the default user interface.

Then we could manually define anything related to the filament, like: Chamber Temp Filament Color

Actually I was just looking at Super Slicer and they have this in the "Notes" page of the Filament Settings under "Custom variables."