Add columns to Confluence's JIRA macro

I would like to code a plugin to add some additional columns to Confluence’s JIRA macro. For instance, suppose I have a macro that looks like this:

..<ac:parameter ac:name="jqlQuery">...</ac:parameter><ac:parameter ac:name="columns">summary,key</ac:parameter>..

I will see columns ‘Summary’ and ‘Key’. I would like to be able to add support for an additional column, for instance, ‘WikiLink’ or perhaps some custom API query for the issue. Is there any way to do that with the current plugin system?