Required modifications are described here. Jesse Glick pointed out some required updates specifically for the Team Concert plugin in this question.

The Team Concert plugin is supported by IBM. That said, this implementation will probably be handled by them as well, likely with sponsorship from another company.

To have it solved, the issue is first selected by IBM dev team based on the amount of votes it receives here:
https://jazz.net/jazz/web/projects/Rational%20Team%20Concert#action=com.ibm.team.workitem.viewWorkItem&id=343552

Therefore, it's highly recommended that people interested in this integration vote on the issue. A free jazz.net account is required.