As explained in my previous blog post, in an attempt to develop a solid script to handle ACE (who says I am a quibbler ?), I also played with Data Pump to export and import ACE/ACL in Oracle 12cR1.
I found out that
OBJECT_PATH=NETWORK_ACL exists in
database_export_objects. I could not get many information about that, so I got confirmation from My Oracle Support that
NETWORK_ACL was the right OBJECT_PATH to use.