Jira Portfolio > Program: Need to add a column that displays Epic's Updated date

[Ksenia Arie]

Hi, I'm using Jira version v7.13.4

In Portfolio I've create a new Program. This view displays the list of Epics. I'd like to add a column that shows the last updated date. But when I go to + Add custom field  this field doesn't show up as an option. In JQL that field is called updatedDate and I can use it like I normally would, but I can't add it as a column in Portfolio.

Thank you!
-Ksenia