I need to be able to add Google AdWords under "access to third-party accounts", as well as "Analytics".

Our product has a feature in which we can manage a user's Google AdWords account for them. We _also_ use AdWords to acquire customers. Presently I don't see a way to add Google AdWords under "Access to Third-Party Accounts" _at all_, but we in fact need it in both places. How should I proceed here?