Animation (Legacy) SetCurve() to target GameObject active state

Hey there !

I'm trying to add through editor scripting a bunch of curve to an animation based on a existing game object in my project.

This screenshot is an example of what I'm trying to achieve. Just have reference of some gameobjects in my animation where I can toggle the activeSelf parameter in the timeline.

I managed to understand how to add a curve with SetCurve() of the clip but all the examples use floats and I just want to animate if the object is visible or not (boolean).

I tried something like

 c.SetCurve(targetToAdd.name, typeof(GameObject), "IsActive", AnimationCurve.Linear(0,1,2,3));

But all it does is add a broken reference based on float instead of bool.

I'm guessing because of the last parameter I give that is a Linear animation curve based on floats.

What should I write in the SetCurve() to have a boolean reference ?

Many thanks !