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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.
As for the flash of fallback fonts that occurs before the used google fonts are fully loaded (also known as FOUT or flash of unstyled text / type), one simple solution is to hide the root layout's content on init by wrapping everything in an element and hiding it or by displaying a "loading..." overlay. Then, all you have to do is detect when the webfonts are loaded, using something like FontFaceObserver, to reveal your app by updating the variable your wrapper's css class or the overlay element's display is bound to.