That's a very good question that comes up quite often. Unfortunately, that's not currently supported :(
In fact, it's technically impossible to recover all the information that was originally present in the Monodraw document because the conversion to text is inherently lossy. Now, you can probably try to use some heuristics to recover as much information as possible (e.g., detect boxes, arrows). That would certainly work in many simple cases where there's no overlapping shapes.
Having said that, I've got other, higher priority updates planned in the pipeline before I can even consider whether to tackle this problem.
In fact, it's technically impossible to recover all the information that was originally present in the Monodraw document because the conversion to text is inherently lossy. Now, you can probably try to use some heuristics to recover as much information as possible (e.g., detect boxes, arrows). That would certainly work in many simple cases where there's no overlapping shapes.
Having said that, I've got other, higher priority updates planned in the pipeline before I can even consider whether to tackle this problem.