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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.
Re: your question in the post title I'd say yes, report to marketing because in the end the person(s) work on content and events - both marketing activities. You should also treat this person more like a product marketer where the metrics aren't black and white like those of a growth marketer. If you want to assign metrics as goals for someone in this role, this may give you some ideas: https://github.com/orbit-love/orbit-model. I don't want to assign lead number to a DevRel person.