Get the mirror property value from an AnimationEvent or the Animator

I try to do some stuff in the AttackStart if he hits with left or right but i would need the mirror property to check which side is attacking. My code looks something like:

public override void AttackStart(AnimationEvent eventData)
{
//Any way to get something like this
//var isMirror = eventData.animationState.mirror;
....
}

Is there a way to get the mirror property, thats toggled in the editor, of a animationState or animatorStateInfo from my eventData or the animator itself.
The Speed is accessible but i miss the Mirror.

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