No, I don't think there is any option in ExcelImporter to provide this kind of feature.
In the Export RQM dialog, you may manually count how many "Sending Testcase x names xxx" and if it failed, you would see error right under that. so the successful count should be whole counts deducted from the failed counts.
Another way is in the target RQM project, go to browse test case and check with Modified column, usually the newly exported test case timestamp will be 1 min ago and counting them would know how many are successfully exported.