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: NVIDIA Tegra X1 (nvgpu) - Vulkan Hardware Database by Sascha Willems
Jetson TX2: NVIDIA Tegra X2 (nvgpu) - Vulkan Hardware Database by Sascha Willems
Jetson Xavier/XavierNX: NVIDIA Tegra Xavier (nvgpu) - Vulkan Hardware Database by Sascha Willems