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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.
As for storing data on Filecoin directly, that would require making a deal with a Filecoin Storage Provider; doing so is currently a complex task but reading the documentation should get you somewhere. You will need a small amount of the FIL token to make the deal with an SP, who will then store your data. Keep in mind that something like web3.storage or Estuary.tech may be better for your needs if you need easy access to the files later; Filecoin can (currently) be thought of as closer to archival storage, but efforts are being made to make it more generally useful too.