Well, if you had an issue with Terraform wouldn't you first look to see if there were already a module for it?

But in the case of "global" tables, they are by definition cross region and CloudFormation stacks are per region.

Looking at the code from the link...

        for region in event['ResourceProperties']['ReplicationGroupList']:
            replication_group.append({ 'RegionName': region})

It is doing stuff across regions.