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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.
I can't see your application, but in general when I want to build my own application from scratch I build it by adding stuff to a "starter" or "seed application" like https://github.com/sahat/hackathon-starter . That seed application runs on a backend JavaScript server called Node.js which you would have to learn, there are books on Node.js on Amazon and also playlists on places like YouTube, Udemy, and Coursera. For deployment of small apps like apps built from that starter I like to use an online service called "Heroku". You need to know how to use the command line and a code management and version control tool called "git" that hooks into a website called GitHub where code like the code for that seed application is hosted. There's a big learning curve. There are other tools and methods that you can use. For example there is a thing called "WordPress" that can be used to build websites with PHP on the backend instead of JavaScript. WordPress has a drag-and-drop user interface builder. WordPress is used a lot for small businesses like little stores that sell stuff online. If you're an individual making a personal web page there are no-code, drag-and-drop personal web page builders like Wix and SquareSpace, but those pages are more for showing off static content than providing any interactive functionality. I think Amazon Web Services and Microsft Azure Cloud also offer low-code simple app building services for apps that aren't meant to look good or be super customized. Without knowing the details of your app, how it looks like or is supposed to look like, and what exactly you want to create, I don't know which approach is best for you.