A way for an addon to export data visible by others?

[Thyl]

Is there a way for an addon to export some custom data that would be readable by another addon? The use case I'm looking at would be sharing some extended player-defined information - so that addon on the side of other players would be able to display it (after targeting the other addon user with the reticle). I've seen addons using it in roundabout way - synchronizing data through saved variables, custom external app and server; I wondered if there's a more direct way for doing the same. Thanks in advance. ^^