Adding multiple offline signatures to a procurement contract

Our client has a requirement to include multiple offline signatures for different contract owners to the same buying BU, and under the same customer name (BU name). At the stage for submitting the signature, the system only asks for one signature from each party (1 from customer and 1 from supplier), even if multiple contract admins are added to the customer party.

Please refer to the attached.

Is this functionality possible?, thanks