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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.
I have no clue what exact solution would only favor react, there are enough implementations for vue and even if not, most of the greater players have generic solutions, not vendor-locked integrations.
I guess they want it to be framework agnostic, but it's still fully React-only. The Svelte portions of their docs are just placeholders and everything is WIP Source. In that same issue, you will find that it works already with Vue.
Prismic: That's not a library, but a CMS? Anyway, here's their Vue repo which is a 1:1 match to the React counterpart?