It may be a good idea to include the "Make Asset" operator in the search menu. But currently it will only work in the Outliner and if items are selected there.

We could:

• Hide it from the search menu outside of the Outliner.
• Show it but throw an error, explaining that it needs to be executed in the Outliner.
• Somehow support the operator everywhere. E.g. it could create assets from the selected objects in the 3D View.
• Always hide it from the search menu (OPTYPE_INTERNAL).