Critical Roll in macro

Yeah I know, I have found a bunch of these already but none I have found do what I need and I want to know if it is possible. I want to create a line in a macro (example: Item 1 [[1d20cs>20+8]] for [[1d4+4]]) that will automatically double the dice if it is a crit. All I have found so far is to add a "add [[1d4]] if crit" to the end which really messes with the formatting I am trying to use. Is it possible? If it matters I am doing this for a 5e game.

The default 5E sheet already does that with crits. Are you not using a pre-made sheet?

No, because the default sheet does not calculate the rolls for Animate object which is the macro I am trying to make

No, because the default sheet does not calculate the rolls for Animate object which is the macro I am trying to make It would if you made a sheet for it, but beyond that, let's use the NPC attack template as it will automatically calculate crits: &{template:npcaction} {{attack=1}} {{damage=1}} {{dmg1flag=1}} {{name=Animated Object}} {{rname=Slam}} {{r1=[[1d20+8]]}} {{always=1}} {{r2=[[1d20+8]]}} {{dmg1=[[1d4+4]]}} {{dmg1type=Bludgeoning}} {{crit1=[[1d4]]}}