Create Open ended Subscription contract without end date from Order Management

Is there a provision to create an Evergreen subscription contract (open-ended subscription with no end date) from Order Management?

We reviewed the available REST API examples but couldn’t find any reference to creating an open-ended subscription.

In our testing, when we create an order with subscription items, the order is created successfully only if we provide service duration details or pass both contract start date and end date. Otherwise, we must define the service duration at the item (PIM) level.

Has anyone implemented creation of an evergreen/open-ended subscription contract from Order Management? If yes, please share the approach or configuration/API details.