I’m pretty skeptical of the actual usefulness of these types of tools, but certainly if someone created one in Julia I would be glad to try it out.
As far as GUI’s in the Julia data ecosystem go, I personally very much would like to have an interface for viewing DataFrames and easily creating interactive plots from them. Unfortunately I really hate working on anything that even remotely involves a GUI, so the chances that I will start working on something like this myself are 0.