I want certificate should get attach to few request in collection, others I want to verify with the token

I want to include few requests to get submitted with the certificate, remaining should work on the token based authentication as it is.
I know we can add the certificate in post man but then for each request certificate will be sent.
I want to attach certificate for few requests.

Is there any way I can add certificate in the Pre requisite using the code? Or any other way few request I want certificate should be sent and not for all.