The only animation notification class: AN_Footstep.

It has a parameter on it to represent the character slot that the notification triggered.

You can use the animation modifier to generate this animation notification and modify the parameters to update the generated effect.

You can apply this modifier in the animation data modifier panel by finding BP_AnimFXAnimModifier through AddModitier and clicking ApplyAllModifiers, or right-click on the added modifier and then Apply to apply the recently added animation data modifier. After applying, you may need to fine-tune some animation notifications because the calculation of this modifier is not very accurate now.