How to extend the image asset type to add custom attributes?

Hello,

I'm trying to make a simple modification to the default image asset and am running into a wall, and am sure I'm missing something simple.

I need the image element to have an additional attribute that I pass into it, called mySpecialId. I can't figure out how to get the asset to render this into the DOM.

I think I'm supposed to extend the image type like this, and I think I should be using the updateTarget method like this:

am.addType('image', {
    view: {
      updateTarget( target) {
 
..some code here, but what?
      }


    },
     
  });

But it's not working. When I click on the image, nothing happens. I think that's because I'm replacing the base updateTarget logic in the image, whereas I want to extend it.

When I try to create my own, second asset type - image2 - nothing renders in the asset explorer. I think that's because the default asset render command only renders assets of type image, but I can't figure out how/where to make it render other kinds of objects when someone drags an Image onto the canvas.

Help greatly appreciated.

Thanks Andrew