Eye tracking for VRWorks SDK

Gaming and Visualization Technologies XR – VR/AR/MR XR – VR/AR/MR
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Hi! I have a Vive Pro Eye and started working on Variable Rate Shading (VRS). I see the demo VRS included the mouse pointer as a dynamic VRS. I am trying to replace it with the built-in eye tracker. I checked the easy vrs-eye tracking integration blog, but still some points are unclear:

  1. following the blog, does nvapi contain the gaze/eye tracking function that I can use in vrworks?
  2. Previously I worked with unity and unreal, where sranipal plugin did the tracking part with runtime software. If previous nvapi can track the real-time gaze positions, that mean I no need the sranipal runtime. Am I right?

It would be great to have some suggestion.