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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.
I wasn't aware of Zettlr when I started using Obsidian. I do recall looking at the features and may have tried it briefly but went back to Obsidian. From the Zettlr feature list I don't see plugins as a feature. Quick googling shows it appears to be something they will not implement any time soon because it is too difficult: https://github.com/Zettlr/Zettlr/issues/657
There are many ways to include LaTeX math in markdown files. The downside is that there's no consistent standard. Markdown math that looks fine rendered in one tool won't display correctly in a different setting.