In Ant, how can I dynamically build a property that references a property file?

Question

I am using Input tasks to collect specific property values and I want to concatenate those into one property value that references my properties file.

I can generate

Answer 1

Solution is : Consider problem is this, where you want to achieve this :

 (double expanding the property)?

You can use javascript:

I gave it a try and this is working for me.