Using the `outputJSON` interface is slower than combining `JSON.stringify` with `outputFile`.#1048

RT I encountered this issue in my project: using the outputJSON interface with some large files is very slow. Upon investigation, I found that the method relies on the jsonfile library, which hasn't been updated for a long time. The method itself is quite simple, so since it's causing problems, I suggest rewriting it directly in the code instead of using the corresponding method from this library.