Get ready to swoon some more. “Bridgerton” executive producer Shonda Rhimes and Julia Quinn, the author behind the novels that the TV series is based on, are banding together to bring a new element to the Regency-era romantic hit. They’re working on a prequel novel, Deadline reported Thursday. The book, based off of the upcoming spinoff series about Queen Charlotte (played on the original show by Golda Rosheuvel), will detail the love between her and King George and its societal implications, according to Deadline. “Queen Charlotte has been such a moving character to write and now having the o…