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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.
Here are some well documented macros to get you started. They will show you some common scenarios for both dice rolls and chat messages.
And lastly, since the Foundry community is largely open, you can view the source of pretty much every module and system there is, and there is a good chance that someone has already done what you are asking - like this macro here that adds PowerCard support to Foundry. Yes, I kind of buried the lede, but I wanted to point out both that resources to learn to program your own stuff are available (if scattered) since JavaScript is a standard language as well as that most users won't ever need to learn it because someone else has likely already done whatever it is that they want. Also, the macro is 4 months old, so your mileage may vary, but it you do learn JavaScript/HTML, you can probably fix it with minimal Foundry specific knowledge.