Set custom caption for .DataAxis.Totals

[kiln]

Does anyone know if it is possible to set the caption property for
DataAxis Totals, for each column in a pivot table?

The caption in general can be set thus:

..DataAxis.Totals(0).Caption = "Sum in Dollars"

I'd like to do something like (psuedocode)

..DataAxis.Totals(0).value(0).Caption = "Sum in Dollars"
..DataAxis.Totals(0).value(0).Caption = "Sum in Yen"

However I cannot find a way to access the caption property for each
column.