Man, given all the comments suggesting frameworks that will require you to do html/css/js it seems like no one has really read your post.

For your use case I would look at AppSmith (https://github.com/appsmithorg/appsmith) or ToolJet (https://github.com/ToolJet/ToolJet).

These are full-stack low-code frameworks, but it's easy to use them to do just the frontend and connect to a backend API you implement yourself separately.

Edit: forgot to mention that these support drag&drop for building user interfaces :)