Where should we add the ca editor config page in order to work for /config/global folder?
theoretically it is possible by
adding a content folder e.g. /content/global with a property sling:configRef pointing to /conf/global
adding a CA config editor page below /content/global
but in practice this does not work as currently the sling caconfig implementation has a special treatment of fallback paths like /conf/global and does not allow persisting configuration to them using the caconfig management API (on which the CA config editor relies):
https://github.com/apache/sling-org-apache-sling-caconfig-impl/blob/acc61e506c22a22e2d7d31fdff9340b702b40d86/src/main/java/org/apache/sling/caconfig/resource/impl/def/DefaultConfigurationResourceResolvingStrategy.java#L242