Export change sets in csv format with custom information
One answer
The Eclipse client supports Saving change logs: https://jazz.net/help-dev/clm/index.jsp?topic=%2Fcom.ibm.team.scm.doc%2Ftopics%2Ft_scm_eclipse_change_exp_save.html
Anything else will likely have to be a custom solution you have to develop. In that case I would suggest looking at the SCM command line see the help https://jazz.net/help-dev/clm/topic/com.ibm.team.scm.doc/topics/c_scm_cli.html