While there have been some experiments and related discussions concerning parsing XML files here, I'm afraid that the answer is "No." Monarch Pro doesn't import XML readily and easily as it does CSV and other formats.
Depending on the record structure in question though, you could be successful in treating the XML as a regular text report and develop a normal model with detail and append templates. Others have been successful in doing so.
A few things to watch out for - forcing line breaks, missing details, and field length issues are quite common. But in general, as a quick and dirty way to get what you need from XML, Monarch can be quite effective.