For example can I add
-webkit-backdrop-filter: saturate(1.8) blur(20px);
on a Layer to quickly simulate background blur?
Yes, you can use a Layer's style
property to set custom css styles. Example:
layerB = new Layer
image: Utils.randomImage()
layerA = new Layer
layerA.style["-webkit-backdrop-filter"] = "saturate(1.8) blur(20px)"