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SurveyJS
Open-Source JSON Form Builder to Create Dynamic Forms Right in Your App. With SurveyJS form UI libraries, you can build and style forms in a fully-integrated drag & drop form builder, render them in your JS app, and store form submission data in any backend, inc. PHP, ASP.NET Core, and Node.js.
Even if you want a CoffeeScript-like language, in principle it's possible with Svelte. Right now it's a bit messy, to make it work more smoothly, CoffeeScript compiler would need to be tweaked to support $: labels, other than that it's just some rollup configs. But the thing is - CoffeeScript-style languages are not very popular since ES6 came out.
One thing that's great about Imba documentation is the initial page. If you open imba.io, those examples look extremely tempting, and answer "Why should I care about Imba" question really well. Unfortunately if you want to follow that, and click "Getting Started", that's where it all ends.