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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.
If you do still want to build it yourself, I'd recommend the MDN docs and Google's WebRTC site for details on how it all works. Even then, you'll probably want TURN servers hosted by someone else like Xirsys due to the networking issues you can run into with self-hosting.
I found https://github.com/developerspace-samples/WebRTC-Kotlin-Sample which i'm taking as a guide and inspiration for my application but will move over to more robust libraries when i grasp the idea behind it.