Is it possible to independently scale layered assets in an image preset?

Hello!

First a little background. I am serving up a Scene7 asset that is made up of two layers, a base image and a play button. The base image layer is a smart crop whose width and height are being constrained by the image preset (1200 x 500). This image preset is also handling the layering of the base layer and the play button.

Here is the code that I am using to manage the layering, cropping, etc.:
&layer=0&fit=crop&layer=1&scale=1&src=URL/play-button-shadow&originN=0,0

This works fine for placing the play button in the center of the background image. 

The issue is that, because the asset is being scaled to fit the image preset, the size of the play button changes with every image.

So my question ... is it possible to have one layer of an image preset scale independently from the other layer? If so, how would I do this?

Thanks!!