aggregate model and image in custom component

I have couple of questions on custom component

1. Can i use any image property that will let us choose image from static resource?

2 I have built one simple custom component that lets us choose a model and then select any field [using model and field properties] from that model. This works well for simple model but for aggregate model how to select the aggregate field? Currently, it is showing all the fields and not the one i am aggregating on.

  

I am having the same issue, did you ever figure out a work around?