We usually report "Engagement Rate: #engagements / #views" to our clients. I wish I could check this metric on Own Videos Table.
these kinds of custom changes to our default metrics are a perfect fit for using our custom metric builder / QQL Console. New columns like the one you described can easily be added to the Own Videos Table this way. We just got informed that our support team was already in direct communication with you and they could help with creating the proper custom metric. Let us know in case there is anything else in that regard.