UUID for groups

You can use the People Functions plugin for this.  People Functions has a lot of useful functions including the one you're looking for called getgroupuuid().  Hope this helps!

You can use the getgroupuuid() function, which is included in the People Function plugin.

https://community.appian.com/b/appmarket/posts/people-functions---plug-in

getgroupuuid(
  group:Replace_This_With_GroupId
)