You can use "scm list changesets" and "scm list changes" commands to get the change sets and files modified on the steam.
Then use "scm diff" to show the difference of a file in two change sets. You may need some scripting to get lines of changes then.
David Lafreniere selected this answer as the correct answer
FORUM MODERATOR / JAZZ DEVELOPERJul 11 '16, 11:23 a.m.
There currently is no build-in feature to determine/calculate the LOC. The answer above would be one way, or you could load an entire workspace/stream to disk, then write your own tool to walk/read the files, generating your own report of the LOC per file as you go.
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