I new in using Wowza version 4.1.0 I am trying to realize

to take an incoming HLS stream http://xx.xx.xx.xx:8080/hls/stream.m3u8 into an UDP multicast stream targeting to UDP://yy.yy.yy.yy:1234

I used the search function in the forum and in the articles and found a lot of articles and topic to do it vice versa: UDP to HLS.
only a few deal with my problem and I honestly am a little lost in what I found, because a lot of stuff is related to older outdated versions.
Probably it will be using the PushPublishMap.txt - but what do I put there and what else do I have to set up?

I got so far in changing PushPublishMap.txt: UDP target is defined. But what Do I set as source?

# Push Publishing Map file, format:
# format:
xystream={Profile:[profile], [additional-configuration-items]}

#myStream={profile:"rtmp", streamName:"myStreamRTMP", host:"localhost", application:"live", userName:"myuser", password:"mypassword"}
myStream={profile:"mpegts", streamName:"xyz", host:"yy.yy.yy.yy", port:1234, rtpWrap:false}
#myStream={profile:"rtp", streamName:"myStreamRTP", host:"", videoPort:10002, audioPort:10004}
So I would appreciate a lot if somebody of you experts could summarize what would be the best way to solve this task.

Thanks a lot and kind regards