Howto to clearly identify declined meetings in REST interface?

[SuperBeaker]

We use the html view provided by the REST API to display calendars for our conference rooms on our intranet (so that all users, including non-Zimbra users, can view the conference room schedules).

Example: mail.example.com/home/confroom1/Calendar.html?view=week

More details on the REST interface can be found here:
ZCS 6.0:Zimbra REST API Reference:Get Calendar - Zimbra :: Wiki

Our problem is that we don't know how to clearly identify declined meetings on this calendar (all meetings show with the same color and transparency). Because of this, some people will see a meeting on there and think "Aha! The meeting is scheduled!", even though the conference room declined the meeting request.

Ideally, the meeting organizer should have noticed that the resource declined the meeting and rescheduled, but of course that doesn't happen

Is there a way to make declined meetings more obvious in this interface like in the Advanced Web Client?