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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.
PS: If you are curious, this is my React Template that I was describing above.
I'm trying to solve this exact problem right now! But I also want to be able to update and upgrade my projects so I'm using npm packages instead of boilerplate repos. Tools that support plugins are done via that, and for the rest I created packages that distribute config files in a monorepo postinstall. It's not done yet, shifted my focus to Advent of Code and hadn't switched back since. But when it's done it will be here: https://github.com/AlexAegis/js