Hey, I was wondering how can I make an ability show as toggle for example "Show as OFF GCD: Dark Arbiter" that is in the ingame settings? (these are just examples)

I have added in settings Death Coil as a OFF GCD:
Unholy = {
= {
-- Abilities
ArmyOfDead = true,
SummonGargoyle = true,
DarkArbiter = true,
DeathCoil = true
},

Shows in game as a toggle, but the toggle doesn't do anything. What else do I need to change?
Also is there a way to make a keybind for these toggles? Like keybind to toggle CD on and off, like that?

You need to implement that in the rotation file aswell.
Nowadays we try to use a generator to do it, so you should also add it there: https://github.com/herotc/hero-rotation-generator