Postman ENV file and Jenkins

I’d like to add my postman env file to my jenkins server either as a secret text or secret file.

I have a postman project set up in my jenkins server as a freestyle project. For obvious security reasons, I’d like to keep the env file secret in my jenkins instance.

I’m finding a lot of resources on how to do this through a pipeline, but not a freestyle project.

On a different (non postman) project, I tried to add my code variables as secret text without any luck.

Is there a magic way to add the entire postman env file at once?