Updating Deliverables Tab DFF in Project Contract using the Manage Import Activities is possible?

Summary:

Is it possible to use the Manage Import Management for the Contract to update the DFF of the Deliverables Tab on the Contract?

The Contracts are already active and some of them are closed?

Content (please ensure you mask any confidential information):

We are required to update the DFF values already assigned to the DFF Fields and change it to another value. There are thousands of contracts that need to be updated on the Deliverables Tab DFF. Is there any way to update the DFF on the Deliverables Tab?

If this is possible what Interface Table should we take to update the deliverables tab DFF?