The Vulkan 1.2 supported features, properties, and extensions for Jetson devices can be found in the Vulkan Hardware Database by Sascha Willems: https://vulkan.gpuinfo.org/
Jetson Nano/TX1: http://vulkan.gpuinfo.org/displayreport.php?id=9307
Jetson TX2: http://vulkan.gpuinfo.org/displayreport.php?id=9315
Jetson Xavier/XavierNX: http://vulkan.gpuinfo.org/displayreport.php?id=9316