How to change the sidebar icon of a document that appears in Xcode's documentation browser?

[flocked (Florian Zand)]

How can I change the sidebar icon that appears in Xcode's documentation browser? I want to change the icon of a document:

In specific I want to use the icon of an extension page like bellow as I wrote my own extension documentation. I don't mind to recreate the icon.

Is there a metadata for it?

[daniel-grumberg]

We don't normally discuss Xcode specific features on the Swift Forums. You can however file a feedback using the Feeback Assistant app.