How to choose a derived attribute as a parameter in FME?

Is it possible to have an FME parameter read attributes from a feature class that has been defined in a previous attribute?

So, in other words, I when selecting the Prompt and Run option, the user chooses a feature class. In the below example, it's a feature class from a geodatabase, but could just as easily be any format. Once they choose the feature class, I want a dropdown to appear showing the list of attributes that are in that feature class.

This would be similar to the functionality in an ArcGIS tool that has a derived parameter.

I was wondering if a python parameter could read the attributes and then return a list for the user to choose.

Is this even possible in FME?