Export a created terrain using procedural Foliage tool

I am new in unreal engine. As my first project, I have created a terrain with procedural Foliage tool. The landscape includes multiple tree types and present a random forest. Now I wanted to export the forest (include all the trees) to a CAD file so I can scale it and 3D print them. Every time I try, it only let me to export one tree at the time. Is there anyway that I can export all the trees together?