Dear all,
I just succesfully tested balenaOS on the Advantech AIR-020X, a Jetson Xavier NX carrier board.
Details can be found here with some infos about internals, hardware, use of GPIOs etc:
https://www.nico-maas.de/?p=2569
( Spoiler: It just works straight out of the box 
! Booting from the internal NVMe would still be nice, however, the 16 GB eMMC are big enough for most applications and you can still use the NVMe for mounting storage into a container. )
Regards,
Nico