HoloLens 2: Can we access images from internal eye-tracking cameras of device wearer?

[Microsoft Windows]

Is it possible to access images/data from the HoloLens 2's internal eye-tracking cameras when a user is wearing the device? I understand Research Mode provides access to various sensor streams, but I specifically need to capture images of the wearer's eyes for pupil measurement. While I can access the user's view through the world-facing cameras, I haven't found documentation about accessing the internal eye-tracking camera data. Any guidance would be appreciated.

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