AUv3 Keyboard on iOS

When I make a TextEditor and add it to my view, it will only spawn a keyboard in the standalone, not the AUv3.

I understand that a sandboxed app doesn’t own the view (see the popup menu discussion elsewhere in this category), but many AUv3s are able to spawn a keyboard for preset naming, etc. Is there a host trigger for this? I can’t find anything in the AUv3 wrapper that mentions it specifically.