UPDATE: lowering a bid to see your interest and adding a sentence about my regular fixing of incomplete D3.js work by other freelancers here. I actually was the only one to adjust one radial chart well for other employer here in the past.
Hi, Matt Sergei here (do call me Matt, please) - what help you need exactly?
For radial tree it's crucial to have proper hierarchy data - if there are at least relations in the data then proper structure for the D3.js chart can be scripted.
So please provide more details.
Otherwise I'm a webmaster and developer for 26 years, scripting web charts more extensively in last 7+ years. Usually I have to fix incomplete work by other freelancers at least twice per year (4 times in 2020).
This is my lowest half day rate (I'm incorporated). On vacation from Sunday till Wednesday, Jun 30th yet can discuss and work on this project.
Regards and hope you're safe,
Matt