Automating Basic Design Work

Is there a way to automate some basic design work in Inventor Pro 2018 or Materialise Magics software?
(Note I can only use stl format from working with scan data but would be open to converting files to another format if that makes the automation process easier)

I am investigating 3D printing a large volume of customs parts and I want to add a simple key chain hole feature and some text (both as a body) to a stl file I receive from scan data. I can do this individually to each part but was wondering if there is a good way to scale this process up.

The files are all very similar in geometry but adding a feature and a text body to 100's of files individually seems like a good opportunity for some automation or macros to help save time.

Any help would be appreciated.