How we can use faker in Postman v 7.2

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Taken from the dynamic variables section:

https://learning.getpostman.com/docs/postman/scripts/postman_sandbox

Note that dynamic variables cannot be used in the Sandbox. You can only use them in the {{…}} format in the request URL / headers / body.

{{$guid}}: Adds a v4 style guid
{{$timestamp}}: Adds the current timestamp
{{$randomInt}}: Adds a random integer between 0 and 1000