You could define custom format codes.
require 'axlsx'
p = Axlsx::Package.new
wb = p.workbook
s = wb.styles
date = s.add_style format_code: 'yyyy-mm-dd'
percent = s.add_style format_code: '0%'
padded = s.add_style format_code: '00#'
wb.add_worksheet(name: 'Formatting Data') do |sheet|
# require 'date'
sheet.add_row ['Custom Formatted Date', 'Percent Formatted Float', 'Padded Numbers']
sheet.add_row [Date.today, 0.2, 32], style: [date, percent, padded]
end
p.serialize 'format_codes_example.xlsx'