Type of transaction is usually in the CDA documents, but the other data is not always present in each document. You could create a report or display the data you are looking for if it is present in the CDA from the sending system.
For example if you wanted to create a report that would have the document type in it you could create a mapping with this logic in it:
message = qie.createCSVMessage(true, '"', ",", 'UTF-8');
var docType = source.getNode("/ClinicalDocument/code/@displayName");
message.setNode("1", docType);
and then output that to a new destination that would be a csv file. You could then get your volume based on the contents of the csv file.