Import Customization File using a!deployment

Hi,

We're trying to automate the process of committing application changes to an external VCS (Git).

To do this, we're leveraging the Post-Deployment Process configuration of apps, where we trigger an external job and pass the deployment files in order to commit those in the VCS using Appian Version Client.

We're trying to retrieve the import customization file used in the deployment via 

a!deployment(<uuid>, "customizationFileId")

Our goal at the minimum is to get all the property keys in the import customization file.

Help greatly appreciated.

Thanks!