Hi Dhrupa,
With current implementation, you can use Rerun text box which will allow to rerun any test case if it fails. The number of times to rerun depends on the number you enter in the textbox (If you use 1, any test cases that fail will rerun only once). If your callback should only happen in case of failure, you can select the Condition "FAILURE" as shown below.
Regards,
Subject7 Team