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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.
Great! Feel free to join us on GNOME matrix channel. We have a friendly group there and we are offering our help to all extension developers.
Personally, I will support older Shell versions for my own extension, since I wrote an API for that and I want to give older versions more new features + I'm supporting 3.36 until 2025.
Regrettably said extensions do not export vector graphics, though after looking into it, the web tool that the most popular one was based on does. It can be found at carbon.now.sh