Keyframes (position and anchor)

[jackien1]

position: { x: "50%", y: "100%", }, anchor: { x: 0.5, y: 1 }, animations: [ { key: "x", easing: "ease-out", frames: [ { time: 0, value: -2000 }, { time: 15, value: 0 }, ], }, ]

I want to get the image to return to the position + anchor with 0 so it looks like its sliding in from the left. I tried doing 50% of instead of 0 but that doesn't work either. Do I just have to calculate the original position from composition width * 0.5?