How to access absence summary text for reports

Hello,

Our team looked for a way to get an overview of absence times of the whole team. Therefore, I'm currently writing a report to list absence times of all team members.
How do I get the summary text that team members entered with every absence? The CONTRIBUTOR_ABSENCE of the APT_SNAPSHOT contains contributor information (id, user id, name, etc.) as well as start and end dates, but the summary text is missing. Same story with com.ibm.team.apt.resource.ContributorAbsence in the LIVE_SNAPSHOT.
I browsed through many other tables but did not find the absence summary text.
Is it possible to query the summary text of a scheduled absence entry?

I'm working with RTCz 2.0.0.2.

Thanks in advance!
Juergen