Viewing line numbers from Microsoft Project MPP file

I’m looking for a macOS (and ideally iPadOS) project planning tool which can both import and export MPP files. OmniPlan seems a little stronger than Merlin for this (Merlin cannot export MPP files), but I can’t find a way to display the imported line/task number (not the uniqueID) in the field chooser (which Merlin can) - and colleagues using Project often reference it. Is there a way to show it?