Load csv attribute as an entitlement or how to form entitlement policy based on app attribute

Hello we have a disconnected app for which we load users into okta using the CSV application. We have an attribute called roles and would like to manage it as an entitlement in okta. How do we mark/create this as an entitlement so it shows up under governance entitlements?
If thats not possible how can we create an entitlement policy which is based on value of application user attribute instead of the user profile attribute?
This disconneted application does not create any users into okta just to be clear… we want to use it just to certify access for a disconnected app.

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