Transforms

{
    "transforms": [{
        "name": "Thumbnail",
        "handle": "thumbnail",
        "mode": "crop", // crop,fit,stretch
        "position": "center-center", // top-left,top-center,top-right,center-left,center-center,center-right,bottom-left,bottom-center,bottom-right
        "width": 60,
        "height": 60,
        "quality": 0, // 0 Auto, 10 Low, 30 Medium, 60 High, 100 Maximum
        "format": "jpg" // jpg,png,gif or remove for auto
    }]
}