Holiday Year - adding more than one previous year in history

We have staff in different countries whose holiday years runs mid year.  We joined in 2021 so can only have one prior year 2020.  This means for staff with mid year allowances their 2019-2020 holiday isn't allowed so gets added to 2020-2021.  Meaning their current holiday year shows as longer than one year!  Please can you allow users to add more than 1 previous calendar year.