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It's not clear that "<use the binding source>" node in tree is matching with "null" value. I think, changing this text according style of the other nodes text (data_string" "desciption_or_type_string") will be much more clear for users. See the screenshot.
Created attachment 40494 [details] null.jpg
I don't see more consistency in your proposal than in the current solution. The other nodes are rendered as (propertyName, type) pair. What you are proposing doesn't match this pattern. The current solution has been thoroughly discussed with our UI designer => closing as will not change.
Well, OK. Closed.