Exporting external sensor data

I've built two Rejsa RuberTrac tyre temperature sensors and they're working great in RaceChrono displaying 9 temperature bands across the width of the tyre. What I really need to be able to do is log these temperatures at all times during the session and export it along with a timestamp (similar to what's shown in the graph on the analysis page).

How do I go about doing that? Exporting session data just seems to output min and max values for things like speed, elevation, g-force etc without the option of what channels to export.
Thanks in advance
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