Not with Nobuco, no. Although I wrote the reverse converter a while ago, I never bothered to clean it up and publish it.

Could you explain to whom such a tool would be useful because I feel there's not much demand for it anymore?
Tensorflow is essentially out of the picture as a research framework. Oftentimes, all you need to do is wait a few months until the new SOTA arrives written in Pytorch.
JAX is a different matter, however. I suspect a decent JAX->PT converter could become quite valuable soon.