format_code: '@' will work for you. Below is the code for reference.
def default_data_type_as_string @xlsx_package = Axlsx::Package.new @workbook = @xlsx_package.workbook @worksheet = @workbook.add_worksheet(:name => "Introduction") default_style = @workbook.styles.add_style({ format_code: '@' }) row_data_array = ['1', '2%', '3$'] @worksheet.add_row row_data_array, :style => [nil, default_style, nil] @xlsx_package.serialize('default_data_type_as_string.xlsx') end
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