Ability to import and map 'last order date' and 'birthday' fields via CSV

I want to be able to import 'last order date' and 'birthday' fields when uploading contacts via CSV. This is important because I need to track these specific dates for my contacts, which are currently not supported by the existing CSV import mapping options in SAGA. The current workaround of using the 'Notes' field is not viable due to a known duplication issue.