AnimClip Curve to Animator parameter

Hello! I have an animation clip that has a curve defined (it is a running animation with a custom curve that basically says "is right leg on the ground or not"). In the import settings, I name this curve 'IsRight' and then I create a parameter with the same name in an Animation Controller that uses this animation within one of its blend trees.

When I run the game and select an object using this Animation Controller in the Inspector, I can see in the Animator that this parameter is "grayed out" which I guess means its value is driven by the animation, but it always has its default value (false).

Is there anything I need to do to connect the Animation Controller to the clip's curve? I have been reading all the available documentation for hours now but did not find anything useful.

Thank you!