Hey George,
Vulkan is only available via Source. The libraries are only included in Source. If you build the editor with the NDK or Vulkan drivers installed, you’ll be able to package with Vulkan support for Android as well as run your project in Vulkan. You’d have to run it with ‘-game -vulkan’ and that’ll run with Vulkan via PC Preview.
You are not able to launch the Editor in Vulkan, it’s not available at this time.
Thanks!