Make nested route inside AuthenticatedRouteMixin accessible

I'd like to "free" one nested route, so that also users who are not even logged in can access this route.

For example:

posts - /create - /edit - /show

On the posts route I used the AuthenticatedRouteMixin. With this, all sub routes are automatically protected. Now I only want to make /show accessable. I know that I could use a mixin on /create and /edit and remove it from posts route, but if you have 10+ nested routes and only 1 of them should be available also for not logged in users, it's kind of inconvenient.

Do you know any other solution to that challenge?

If not, I think I have to write an additional mixin for that...

Thanks!