Solved
How can get Thingworx system log info as an output of my service?
How can get Thingworx system log info (generated by my service and subscription associated with it) as an output (response) of my service?
If you create a service under a Thing, then you may click on the "Entities" tab and select "Logs", then select which log entries you'd be interested in, for example, Application log. Then you'll select the "GetLogEntries" service:
For your purposes. I would think you are interested in the "Script" log, the results can be achieve in a similar manner.