I see this post was from couple of years back, since there was no solution provided and it might be useful for the next person here is the approach you can take.
When you are executing scheduled event using wm.mft.schedule:executeEvent you will get only the event execution status success/failure. If you are looking for the output of the event you can get it from event logs using wm.mft.portal.monitoring:getActivityLogForEvent service. This service takes the eventLogID as input.
Thanks,
DSP
#Managed-File-Transfer#webMethods#Integration-Server-and-ESB