Unfortunately no. The XI backend responds only with XML. The Core JSON backend responds in JSON format (through the json cgis). There are a few reports that can be exported as csv, though you are probably better off just converting the xml to csv using one of the many online or cli tools. I think excel can convert them as well.
Former Nagios employee
"It is turtles. All. The. Way. Down. . . .and maybe an elephant or two."
VI VI VI - The editor of the Beast!
Come to the Dark Side.