DocC for custom LibraryItems not supported?

My SwiftUI framework makes use of custom LibraryItems.

The default library items have generous amounts of documentation next to them:

My views are somewhat complex and having similair documentation for them would be quite helpful. I've tried adding DocC style doc around my library item declarations but Xcode doesnt seem to pick it up and I get "No Details" instead:

Is this not supported?

DocC for custom LibraryItems not supported?
 
 
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