Is there a tool that helps with Modern UI column formatting?

Question

It seems like the new column formatting JSON-based solution is much more inferior in comparison to the old client-side rendering with JSLink. I am mostly talking about dev experience.

For example, for the last few years, I've been using an amazing Cisar Chrome extension (credits to AndrewMarkeev) that allows us to write and preview the results live, as we type.

Is there some tool you know of that allows us to write these ugly JSON-based "formulas" for the modern UI?

Answer 1

I haven't used it yet but Chris Kent's ColumnFormatter client side webpart might be what you're looking for.

https://github.com/SharePoint/sp-dev-solutions/tree/master/solutions/ColumnFormatter

Answer 2

The one which became trending recently is SharePoint Site Designer

However, you should compare it to the latest schema from Microsoft, because MS constantly adds new features and Site Designer might have some delay in support for new elements.

UPD
It doesn't answer the question directly, but it's just another tool for convenient JSON manipulation with SharePoint Site Scripts. I misread the question :)