I'm curious why/how is such almost random data useful? Is it for ML training?
About collecting data, LTspice can also export the waveforms, not only display them. It comes with a collection of demo schematics. Run them and export the waveforms as CSV.
The advantage of exporting from a simulator would be that you have total control, the waveforms are reproducible, they are completely described (by tracing the schematic they were taken from, and the exact probing points), and it can all be scripted, or data can be generated only when needed, etc.