Kate Aurthur editorThe once-and-future “Grey’s Anatomy” super couple of Jackson and April — played by Jesse Williams and Sarah Drew — are set to appear on the finale of the medical drama’s 18th season on May 26, Variety has confirmed.Williams left “Grey’s Anatomy” last season, having played Jackson since the show’s sixth season. Drew, who’d departed the show in 2018, returned for a guest appearance in May 2021 to send Jackson off to his new life in Boston, where he was taking over his family’s foundation.