Hey everyone figured I should post this here, I released my tool that will bake meshes within Unity into Signed Distance fields ( RHalf Texture3D’s with -1 to +1 values normalized to the original bounding box magnitude )
https://github.com/xraxra/SDFr
In the project are a couple example scenes showing VFX Graph usage and basic raymarching. The main focus of the tool is baking SDF’s though, so the examples are quick and dirty to show it works. 
hope it helps, it sounds like Unity will eventually have some SDF tools for VFX Graph also.
