A321 First Officer reported a lightning strike damaged the AOA indicator.

Narrative

While descending via the OZZZI1 arrival we began experiencing St. Elmo's Fire around FL220. At approximately FL200 we experienced a lightning strike on the CA side of the aircraft. All systems were operating normally except for the CA AOA indicator which we performed the ECAM for. Prior to the lightning strike; onboard weather radar didn't indicate any hazardous weather prior to our descent from cruise. During the descent the weather radar began to pick up heavy precipitation. We contacted ATL Center to see if any other aircraft reported ride conditions. They responded that no one had recently. We started to experience moderate turbulence and asked for vectors from ATC. We were told that they were working on bringing us North of the field rather than to the South as published. The aircraft was struck prior to any rerouting. Once rerouted; we landed safely at the field. Aircraft suffered a damaged AOA indicator discovered upon post flight inspection.I believe this incident could have been prevented with better routing from ATC. Vectors to an arrival from the West prior to our descent could have navigated around the weather that we experienced and mitigated the chances of a lightning strike. The Airbus does have weather radar; but is limited with its ability to see the 'bigger picture'.