How to add button to the end of rows in script report?

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I am trying to build a script report in which I want to a button in the last column of each row and when a user clicks on the button want to show a modal dialog with data from another DocType.

I tried adding a button field to DocType but that field does not show up in report.

How to create a Script Report and add button in the last column of each row?

Regards,