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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.
A good start for macros is to look at the community made macros - there is a module called Foundry Community Macros https://github.com/foundry-vtt-community/macros
If you want to learn how to code, and is used to make macros in roll20, may be Foundryvtt macros make the bridge. You can start making the same macros you made on roll20 in Foundry script macros, that's a way to start learning JavaScript. I never coded in JavaScript before Foundry, and it's been very educational. You can get the gist of it tinkering with the Community Macros that are available as a module pack. You should also take a look at: https://github.com/VanceCole/macros