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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.
Not sure how to measure it, but you'll need to know JavaScript and React, if you wan't to just put a widget for yourself. If you want it to be included into official build you'll need to use TypeScript and follow the visual style of other widgets. Alternatively, you can create issue on github (https://github.com/OlegWock/anori/issues) with feature request and I'll add it, as it seems to be quite useful widget. But I can't guarantee any time estimates as I'm working on this project in my free time
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