Is there a way to make SSL test without having a certificate in a PCKS12 format ?

I am currently working for a client who wants to test via the Internet on their pre-production environment. The problem is that the use of SSL certificates is necessary and Neoload only imports certificates in PKCS12 format. However, the customer, rightly, does not want to communicate both the certificate and its private key because it must not leave the F5 for security reasons. How do you think I could respond to his request without certificate in PKCS12 format?
Thank you very much in advance for your answer.