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It's not possible. A callFunction() result is one of array, double, string or empty(void) (i.e. the #N/A error) or some runtime error signalled via exception. The numeric double 0 case here is the same as the result of a reference to an empty cell (e.g. =A1 with A1 being empty) being resolved.

Formatting a cell with a display format does not have any effect on its content, in this case it's still empty with no data.