How do we generate data.json?

[Enoumy]

Hey! I was browsing through factorio rendering tools, and I think this is exactly what I was looking for!

I know the last commit was way more than a year ago, but I was wondering how I could use it considering the data.json is not present it the repo, which I imagine is for copyright reasons. I was wondering if there was a way or documentation as to how we could generate the missing json on our own?