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htm
Hyperscript Tagged Markup: JSX alternative using standard tagged templates, with compiler support.
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nunjucks
A powerful templating engine with inheritance, asynchronous control, and more (jinja2 inspired)
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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.
Ezpz. There’s lots of templating engines out there so just choose one you like. React will probably be a bit overkill and annoying tbh, as you have to either use something like htm or Babel and then render it as a string. A tad awkward for my tastes, given how easy something like EJS is instead.
Nunjucks is also relatively famous, small and performant https://mozilla.github.io/nunjucks/