You can view asset attributes in the Outliner the same way you view any other node’s attributes. However, you can also limit the Outliner to only display published attributes.
To view published attributes in the Outliner
All nodes can now be expanded to show their attributes.
Now if you expand a node to view its attributes you see only published attributes. This applies to both asset nodes and their internal nodes. Nodes not encapsulated by an asset do not show any attributes at all.