Hi @flfl and thanks for your query. The Tobii XR SDK works on top of the SRandpial’s own SDK. As you may read on HTC on website @https://forum.vive.com/topic/7012-vive-pro-eye-on-ubuntu-16-or-18/ they do not currently or plan to support Linux with the Vive Pro so unfortunately so long as the manufacturer does not expose their data through this platform, Tobii’s own SDK cannot access it.
Apologies for the disappointing news, perhaps you can find some emulator workaround such as Wine or Virtual Box to accommodate your needs.