Text label based on image size

Hello, I want to use Fancy Product Designer for a wall decals ecommerce and I have a problem.

I have a different designer for every product, with decal image over a wall background picture, where users can change size of image smaller or bigger depending of their own wall dimensions.

It would be great, if I could show a label with decal size, calculated on designer image size. Is this possible?.. how can I get it?...can I trigger any event where i can get image size and change a text component based on this event?

Thanks in advance.

Jose