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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.
Yeah I was confused when I opened up the link as well. This is basically a meta-bug complaining about why the original bug was closed: https://github.com/signalapp/Signal-Desktop/issues/4461
But as the other comments here point out, it's a perfectly reasonable response from Signal's part.
The community already done that: https://github.com/dennisameling/signal-desktop (working on Windows & Apple ARM). Still, I think it's a shame that all the work was done, ready to be merged (needed PRs were open) and Signal devs just shut the door on it.