If the anim length is not equal to 1s, you can translate the range required. Besides that, you can have an actor play the Timeline instead and feed the widget the alpha curve.
Widget animations can actually produce events while the animation is playing, similar to the TL’s Event Track. Double click the key:
…to get a sequencer widget event at the specified time:
Perhaps all you need is a Repeater, the other event above. It spits out an update every frame.