This component does not have a data property, that is correct. You could query the alarm_events table to get the information you are looking for. This may be a little bit tricky though. You could use the system.alarm.queryStatus function to return this information. This may be the better way to go.
To write a specific value to the tag when it is acknowledged you could try using a “Alarm Acknowledged” Event Script.
The Display Path column is most likely empty because you do not have the display path property configured in the alarm on the tag. If the display path property is left empty it will not display anything.