Direct SDF to SDF collision

[simulacrumgames]

I was looking for a library that could do very precise rigid body collisions directly between arbitrary SDFs.
I came across this project and found it extremely interesting, but after digging through the code, it seems the collision detection requires at least one side to have vertices to build a BVH first.

Is there a pure SDF to SDF collision function I am missing or is there some reason this is type of implementation is so hard to find?