Source calendar names in grouped calendar

Hello
I have several google calendars and have created a grouped calendar to show a list of events from all the calendars. This sort of works ok, with one exception – I would like to display the source calendar name alongside each event.

Example: I have calendars called ABC and DEF and have created a grouped calendar called XYZ.
My grouped calendar XYZ display shows
[dd/mm/yy] [Event details]
[dd/mm/yy] [Event details]

What I want to show:
[dd/mm/yy] [ABC] [Event details]
[dd/mm/yy] [DEF] [Event details]

Where the first event comes from ABC and the second event comes from DEF Is this possible?