Yes. This can be done by from Interpreter admin viewer.
In the top right corner you will find "..." icon which contains additional actions. Click "Make Root Admin" and you are all set.
Please note couple other points:
1. If you want to give root admin privileges to a regular interpreter, he or she would have to be be promoted to an administrator first.
2. For Accounts only one requestor admin can have a superadmin privileges. If you want to give the superadmin role to another existing user within the account - please contact firstname.lastname@example.org and we will do it for you.