Connect annother Ticketsystem to zammad

To get better Support for customer we work together with another Company which use OTRS.
Currently, if we do not have the knowledge We fill out a ticket inside the ticketsystem from the other company, gave them our customer data and the contact our customer.

It would be nice If there is a Solution that we could somehow use Zammad as Proxy for OTRS or other zammad Installation. The best solution would be that the customer do have to change the ticketsystem to a third company. (Kind of federated ticketsystem)

May there is a need for a protocol (like ActivityPub) for this?