As an npm user with a paid user account, you can another npm user with a paid account as a collaborator on a private package you own.
usernamewith their npm username.
To add a collaborator to a package on the command line, run the following command, replacing
<user> with the npm username of your collaborator, and
<your-package-name> with the name of the private package:
npm owner add <user> <your-package-name>
To grant an npm user access to private Org packages, you must have an Org owner add them to your Org, then add them to a team that has access to the private package. For more information, see “Adding members to your Org”.