Line item Cost field to be editable within Quote

Hi all,
Have a scenario whereby Users need the line item Cost field to be editable while they are creating or editing a Quote.

It seems default behaviour is to lock this field at all times from within Quote module.
Anyone able to provide a solution please?

Ideally, it would only be locked/not editable after Quote is Won or Lost, but just making it editable would be fine.

Thank you in advance.