You can already accomplish this using built in Excel feature. Steps:
1) Import into Excel the Enumeration set and the values.
2) Use built in Excel feature to restrict value entries based on a list. Here's an example on how to do this:
https://blogs.technet.microsoft.com/hub/2011/06/09/restrict-data-entry-in-excel-with-lists/
3) Make sure the appropriate column in PI Builder is configured to use this restricted list.
Now you can select from the list when you populate the values.