Thanks for the feedback, That’s a good suggestion. Unfortunately, themes themselves can only use CSS and don’t allow JavaScript for more interactivity. Drag and drop functionality specifically requires a higher level of user interaction that’s only possible with a programming language.
In the meantime, you can also check the current list of Community plugins to see if there might be something that offers similar functionality.
I also hope to contribute with plugins in the future, and I’ll definitely keep this type of drag and drop functionality in mind as a potential feature to explore.
All the best