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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.
But obviously, there should be a component or directive that Angular uses to make everything happen. And that "something" can be found here: Angular brings a set of directives like default_value_accessor.ts, select_control_value_accessor.ts, checkbox_value_accessor.ts, etc. All of them implement the ControlValueAccessor interface, which, according to docs, "Defines an interface that acts as a bridge between the Angular forms API and a native element in the DOM."
And there’s one called ngx-cva-test-suite. It’s a small npm package, that provides an extensive set of test cases, ensuring your custom controls behave as intended. It is designed and tested to work properly with both Jest and Jasmine test runners.