Hardware raytracing shaderpack

On Java, no. unless new engine is implemented since shaderpacks relies on a rendering framework (like Optifine) and I think mods like optifine haven't implemented this yet(idk if it's even possible)
Continuum Graphic team is currently working on a new render engine for Java version, which looks promising. It is said that the engine would do harware-accelerated raytracing in the future.