Add post-build action in multiple Jenkins jobs via groovy script

Question

Can someone help me create groovy script that add post-build action to multiple jobs at the same time?

Post-Build I am trying to add is the "re-try build after" set to 3 times if job is unstable or fails. looks like below from the config.xml

I am new to groovy script and not able to get it working..

Thank you

        </builders>
        <publishers>
        <com.chikli.hudson.plugin.naginator.NaginatorPublisher plugin="naginator@1.18.1">
        <regexpForRerun/>
        <rerunIfUnstable>true</rerunIfUnstable>
        <rerunMatrixPart>false</rerunMatrixPart>
        <checkRegexp>false</checkRegexp>
        <regexpForMatrixStrategy>TestParent</regexpForMatrixStrategy>
        <maxSchedule>3</maxSchedule>
        </com.chikli.hudson.plugin.naginator.NaginatorPublisher>
        </publishers>
        <buildWrappers/>