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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'm not familiar with Plotly, but their site says it's built on top of a JavaScript library. In my experience, these libraries handle all the hard work of generating the charts (using SVG or Canvas) and just require to be fed with raw data in some specific JSON structure. There examples (e.g. pie charts) use JavaScript arrays and objects but it's trivial to obtain them from JSON, and it's trivial to generate JSON from PHP.
NOTE:
The number of mentions on this list indicates mentions on common posts plus user suggested alternatives.
Hence, a higher number means a more popular project.