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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.
Yes. Ctrl + spacebar to expand/collapse.
There's slightly outdated documentation on github: https://github.com/calculist/calculist/wiki/Keyboard-Shortcu...
I'm working on getting things updated now. More documentation will be available over the next few weeks.
Reminds me a little of [Numi](https://numi.app/). It doesn't exactly like plain text, but will happily eat it, but loves the math part. Seems this is the opposite of that, loves the text, but will happily digest math.