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excelPerl.pl -ane "$C->[2]->{FormulaLocal} .= '+99'" -f test.xls

perl excelPerl.pl -begin "use Text::CSV_XS; $csv = Text::CSV_XS->new( 
+{ binary => 1 } )" -ane "$csv->combine( map { $_->{FormulaLocal} } @C
+); print $csv->string, $/" -f test.xls

a,b,a+b
1,4,=A2+B2
...
3,2,=A4+B4
4,1,=A5+B5
5,5,=A6+B6