You’d need to read her books and also define your terms, Margarita.
She wrote a book that has a transgender character. She wrote a different book involving a male murderer who bundles himself up in a woman’s coat as a plot point. There’s no hint that he considers himself a woman, no.
Do the many other detective novels featuring disguises also mean that the characters were trans, even if they didn’t know it? Or is that only true when applied to JK Rowling’s work?