Handling non-official facet feature

[lokxii]

The post at://did:plc:ia76kvnndjutgedggx2ibrem/app.bsky.feed.post/3lcov3a3hi2e7 contains custom facet feature type blue.moji.richtext.facet.
atrium_api::app::bsky::richtext::facet cannot deserialize the feature to MainFeaturesItem and therefore the feature field vector contains Union::Unknown instead of Union::Refs(MainFeaturesItem).
Is there any possibility to allow MainFeaturesItem enum to represent a custom facet feature type?