Add button to submissions table in reviewers dashboard - OJS 3.3.0.17

Hi,
I’m in the process of creating a plugin which generate certificates for reviewers after they submitted review. I’m done with admin side of things, where he can customize looks of certificate for each journal and I created script for generating pdf file with it. But now I need to add button in reviewers dashboard on submissions list, which should be visible after review is submitted for a given submission and will allow reviewer to download certificate. How can I achieve effect like on the image below? Each button need to have dynamcially created link with id of reviewer and submission.
My OJS version is 3.3.0.17.

Cheers