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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.
If you're interested in trying to make a mod, you should [check it out](https://github.com/Acamaeda/The-Modding-Tree). A small amount of coding knowledge is required, but far, far less than making a game without TMT. It does most of the work for you. It has a lot of [documentation](https://github.com/Acamaeda/The-Modding-Tree/blob/master/docs/!general-info.md), including a [getting started guide](https://github.com/Acamaeda/The-Modding-Tree/blob/master/docs/getting-started.md). There is also a [discord server](https://discord.gg/F3xveHV) where you can ask questions and get help.