Finish tab in custom script report

Summary:

Can any one help us how we can use custom script in service cloud report

Content (please ensure you mask any confidential information):

We have successfully able to use custom script inside the process tab but now i want to excute in finish tab any working samples are helpful if someone share so that I can find where the mistake I have done

Version (include the version you are using, if applicable):

Code Snippet (add any code snippets that support your topic, if applicable):

i have used few lines mention here

$rowCount=count($rows);

for($i=0;$i<$rowCount;$i++)