Try my path-csv script. The CSV should have a specific format, as documented in the link (there are sample ODS+CSV files here). Note that the file is really raw path points, you have to do any required scaling/shift/transformation before exporting to CSV (using your spreadsheet app, for instance). And remember that for Gimp, the Y increase downwards.
This said, 10K points are likely superfluous, a data point per pixel or so is likely enough to have a smooth line.
Otherwise outside of Gimp there are plotting apps.
This said, 10K points are likely superfluous, a data point per pixel or so is likely enough to have a smooth line.
Otherwise outside of Gimp there are plotting apps.