Extending existing traces in offline mode

Is there currently a way to do this? I know from this doc https://plot.ly/python/file-options/#Extending-existing-traces, that it is possible but it looks like the online version. I have tried it with offline and fileopt is not a valid argument.

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Bumping for visability

Here is how I do it using cufflinks: fig3[β€˜data’].extend(fig2[β€˜data’])

Also cross reference Extending data to the same plot for doing this with a FigureWidget in the Jupyter Notebook