Is it possible to alias a computed property in a component from a controller?

I am trying to alias a computed property in a component from a controller. The component is called comments-sidebar.js

I have tried both of the following but neither of them worked.

unreadCommentsOrChanges:Ember.computed.alias('comments-sidebar.unreadCommentsOrChanges'),

unreadCommentsOrChanges:Ember.computed.alias('commentsSidebar.unreadCommentsOrChanges'),

Does anyone know the correct syntax for doing this or if it is even correct? I have not been able to find any similar examples online.