It would be nice if there were a macro like {EVENT.TAGS} that exports the data in JSON format.  I've managed to work around this by creating all of my tags with quoted names and values and then being crafty in the output specification:   "eventTags" : [\{\{EVENT.TAGS}}]

What I've done is fragile, though as forgetting to quote the tag name and value will break the code consuming the data output.