you won't be able to edit them via drag and drop
... because even if you can drag, you still won't be able to drop. This is assuming that I even know what you are talking about.
I am totally confused by the original post ?♂️
He wants to be able to drag in HTML code and modify it via the visual tools. In other words, do something this program is not designed to do.
This is what i expecting from bootstrap studio.