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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 recently found (Fig)[https://fig.io/] but it's not working the way it's suppose to. It creates another window instead of showing an autocomplete list. Their documentation contains nothing about the issue (or maybe I couldn't find a solution) so I reached out to the experienced users, that you are, in the hope that you've been through this issue before and found a way to solve it.
I found this https://github.com/withfig/fig/issues/1791 if it can help you in any way.