Read and Write Persistent Data from a Custom Lively Web Wallpaper

[DCRedKing]

Hi,
I was wondering if there was any way for me to write persistent data to a file through a lively web wallpaper that I am developing. I know that you can read persistent data through LivelyProperties.json but the documentation says that this is one way communication from the user to the wallpaper. I wanted to know if there was a way for the wallpaper itself to persist data in some way (for example, by writing to an external JSON file). I don't think there's any way for me to write this data to an external file through conventional means (browser Javascript) due to security issues. Does anyone know any way to do this? Thank you in advance for any suggestions/help/guidance.