JWT tymon/jwt-auth refresh token in Laravel

I am using tymon/jwt-auth library in Laravel to generate token. At the moment I am able to create the token:

$token = JWTAuth::attempt($credentials)

The point is I need to generate also a refresh token to return to the user, how can I do it? The final results should be like this:

{
"jwt":"eyJ0eXAiOiJKV1QiLCJhbGciOi . . .",
"refresh_token":  "b5ed616d32 . . ."
}

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