At a press event last year, Bloys told reporters that Rowling was “very, very involved in the process selecting” showrunner Francesca Gardiner and director Mark Mylod to lead the charge on the “Harry Potter” TV series.

https://variety.com/2025/tv/news/harry-potter-series-jk-rowling-trans-views-hbo-1236384958/

yeah, she’s not just a producer, even - it’s fair to say she’s very involved 😅