HI Johannes
Thank you for using NXP portal .Hope you are doing well
(A1) No , there are no any who working with Jailhouse hypervisor and the S32G ,
There are few people which working on Jailhouse hypervisor and the IMX. if you want help, i can transfer your question.
(A2) There are version difference in interrupt system of S32G and S32V. S32g uses GIC500 V3 while S32V uses GIC400 V2.
for eMMC S32G , you can refer eMMC Enablement and Debugging Tips Document (Document Number: AN13667) as reference.
Regards ,
Tushar