Cwebp -resize only if image is larger

cwebp - Compress an image file to a WebP file -resize width height Resize the source to a rectangle with size width x height. If either (but not both) of the width or height parameters is 0, the value will be calculated preserving the aspect-ratio. The -resize option resizes the image to width but I want resize to occur only if image is larger than specified width x height.