Resize Webp images

Question

I had Converted Jpg to Webp But I want to resize the image.

using (Bitmap bitmap = new Bitmap(UploadName +jpgFileName))
{
    using (var saveImageStream = System.IO.File.Open(webpFileName, FileMode.Create))
    {
        var encoder = new SimpleEncoder();
        encoder.Encode(bitmap, saveImageStream, 90);
    }
}