I'm struggling to find the correct syntax for saving into a nested CDT from

I'm struggling to find the correct syntax for saving into a nested CDT from a SAIL dashboard. The snippet below creates a valid paragraph field from my nested CDT value but the saveInto causes an error when updating the form. I am using this style of notation because the elements are generated from an apply function so "IncidentVehicle" and "VehicleMake" are dynamic at runtime. The value will save when hard-coding local!dataArray["IncidentVehicle"].VehicleMake but this isn't an option for me as the .field cannot be parameterized.

a!paragraphField(
label: "CDT Data",
value: index(local!dataArray["IncidentVehicle"],"VehicleMake"),
saveInto: index(local!dataArray["IncidentVehicle"],"VehicleMake")
          )...

OriginalPostID-94523

OriginalPostID-94523