It does work if clienlibs properties are set properly
In order for the client libraries under /apps to be accessible, a proxy servelt is used. The ACLs are still enforced on the client library folder, but the servlet allows for the content to be read via /etc.clientlibs/ if the allowProxy property is set to true.
As per my understanding, you want to access the js files directly and not via client library include, if I am correct, then you can try creating a folder with the name "js" under resources of your required clinetlibray folder and you can access as like below. Its worked for me.