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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'm finding conflicting information out there on the current state of things. On one hand, there are some videos that show compelling examples of HMR working. Those generally are a couple years old. Then there are Github threads like this one in which Angular maintainers admit the HMR story is great right now: "Under the hood, this mostly rerenders the Angular application from scratch, which is better than a full page reload, but could definitely be improved."
Probably not so seamless depending on how many niche dependencies you use. For a more seamless transition, you may want to checkout Rspack, its supposed to be a theoretically drop-in replacement for webpack, one of the maintainers of Webpack rewrote the library in Rust with performance in mind and they say it should have high compatibility with existing webpack plugins and build chains. They are currently working on Angular compatibility, its not available yet, but they are actively working on it. Angular Support PR