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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.
Hey! if you prefer to use something higher level to manage all of the webrtc/calling parts of this, Daily might fit the bill. Here's a sample repo where we built a cross platform audio calling app https://github.com/daily-demos/party-line which should give you a sense for what's possible. It has examples in React, React Native, iOS (swift), and Android (kotlin, java). There are lots of other options from other vendors so definitely check out what they have to offer, but I like to think we make it as easy as possible.