There is not.
Yes, it would be very difficult to do and requires stopping and opening the IoTaWatt. The log file is in binary form and is a unique format.
The new query will support exporting a modest size CSV file. The major hurdle with getting this out is user interface. It’s a substantial JavaScript effort and browser compatibility with things like date/time specification is an obstacle. That’s also holding up a revised new graphing capability.
Even if you don’t have internet, it is advisable to be connected to a WiFi network. That being the case, you can run influxDB or EmonCMS on a RPi for short money and harvest the data that way.