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Directus
The Modern Data Stack 🐰 — Directus is an instant REST+GraphQL API and intuitive no-code data collaboration app for any SQL database.
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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.
Have you looked at Directus? I’m not sure exactly what your needs are (sorry if I’ve misunderstood). I used it for my most recent project as the backend for data entry/queries/administration. It supports MySQL, but admins don’t need to know anything about SQL to do complex queries/filters/CSV exports from the Directus UI.