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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.
Speaking of libraries and implementation. I implemented themes for white label (and not only) on UI via styles as a function of state on UI. I used https://fela.js.org/ for this. So basically, when a React app initializes, a part of the state is initialized (via identity of a user, like email they log in or meta info, or additional API call, or via URL) with a value telling if it's a partner X vs partner Y vs your own brand. Then the styles that have colours, backgrounds, borders, box-shadows, fonts are applied by fela. So I created a bunch of styled components like buttons, toggles, styled divs, etc and each of them has access to that piece of state holding the UI theme, and depending on that theme, it will apply CSS classes in the runtime. You can use the same mechanism to implement multiple themes for your own brand (not just light/dark modes). The only thing you need to manually code is a JSON spec for themes like: