If by "brackets" you actually mean "parentheses", use Format property. Review https://support.microsoft.com/en-us/office/format-a-number-or-currency-field-e48f2312-67f0-4921-aca0-15d36b7f9c3b
#,###.##%;(#,###.##%);0,000.00
or if you really want brackets
#,###.##%;[#,###.##%];0,000.00
BTW...