Error creating the Regional terrafom module of pubsub lite (PubSub Lite Topic Location)

While creating a terraform module PubSub Topic Lite there should be two options for location: Regional or Zonal.
Actual Behavior
For deploying Zonal Topic, it is straight forward since you only need to provide a region and a zone. (No issue)
For deploying Regional Location, there is no clear way to choose this option. If the zone is removed from the arguments it throws and error that a zone must be provided. So it seems, regional location for PubSub Lite Topic is not an option at the moment, Are there any ways to get someone to help me with this?
is there any option do the same