Getting source address from knx_event?

I want to use the source address of a knx event in an automation trigger, but the trigger data of knx_event only contains destination address (address) and event data (data).

The xknx module however deals with the source address as well, as it is printed to the log in debug mode:

2019-10-04 17:47:31 DEBUG (MainThread) [xknx.knx] Received: <KNXIPFrame <KNXIPHeader HeaderLength="6" ProtocolVersion="16" KNXIPServiceType="KNXIPServiceType.TUNNELLING_REQUEST" Reserve="0" TotalLength="21" />
 body="<TunnellingRequest communication_channel_id="1" sequence_counter="152" cemi="<CEMIFrame SourceAddress="PhysicalAddress("1.1.57")" DestinationAddress="GroupAddress("3/1/16")" Flags="1011110011100000" Command="APCICommand.GROUP_WRITE" payload="<DPTBinary value="0" />" />" />" />

Is there any elegant way to retrieve the source address from a knx_event, except from configuring debug mode for xknx and parsing the log for these events?