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That indicates an extension. Is that what you are calling a "desktop browser?" You say it is not yet available and link that site for information. Yet the first paragraph links to an addon page. I can't be sure because that page covers a great many apparently different things, including email that requires a separate account but not a browser or apparently even an email client. I'm still at a complete loss as to what they are claiming to offer and your own use of terminology is only complicating that understanding.
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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.