There was a cutoff of May 4, 2022 in the Cruise with Confidence FAQ's so you may no longer be able to do this. But it's probably worth a try as they had extended it quite a few times.
May I transfer my FCC to another guest?
Yes, we will allow a one-time transfer of an FCC from any Celebrity Cruises sailing cancelled due to global suspension or under the Cruise With Confidence program. The deadline to request a transfer is May 4, 2022. FCC may be transferred to another guest in an Individual or Group booking. All FCCs (new and existing) must be used on a sailing that departs on or before 12/31/2022 or within one year from the original sailing date, whichever is later.