Following along for subitems supported as well, but have the same question as Karli.
Am trying to build an automation that will make a change only when data is first entered into a subitem column, not if the column is already populated and the data changes (is updated or removed).
I’ve got this working on item level columns, but whilst I can select subitem columns it doesn’t seem to work, so I’m hoping a Q1 release will solve this? 
