Hi
unfortunately out of the box for Admin Role have two functions in Data Element:
1. "Admin Role Member List" = Returns the list of members of the specified admin role, separated by "^"
2. "Admin Role Membership" = Returns the list of admin roles the user is member of, separated by "^"
There is no in the list a function for Admin Role owner.
suggestion: please open an idea in our communities to suggest include this new function to get admin role owner in data elements.