A little bit more information would be good. ACS as a file extension has multiple differing possible file types. Are you referring to Microsoft's Agent Character Structured Storage Format? or Archival Cytometry Standard https://docs.flowjo.com/flowjo/advanced-features/fj-acs/ or ...?
It's likely there are Python packages that can read and write the format. If so using JMP's Python Integration will allow you to utilize external Python packages, and you can create input that JMP can consume. Currently with JMP 14-17 that would include CSV files and pandas.DataFrames...
