How to override .services.jwt for user-permissions plugin?

Hi, trying to follow this blog post to move to a cookie auth:

I’ve successfully overridden the auth controller by doing this

module.exports = (plugin) => {
    plugin.controllers.auth.callback = callback
    // = new_jwt
    return plugin
However when I then try to use the commented line to load my custom jwt service things stop working. I know itsa longshot but if anyone knows what is going on that would be incredibly helpful!

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