@anon36056958 I just created a new topic on the SocialHub forum related to this thread, i.e. about arbitrary Linked Data vocab support on the Fediverse. I also mentioned SolidLoV app plans.
I was triggered by the interesting approach of the go-fed ActivityPub library that supports extensions defined as JSON-LD vocabularies using a subset of OWL2 Web Ontology Language. Go-fed uses these as input for codegen to create strongly-typed language support in Go.
Some very cool ideas in go-fed. For those interested I recommend watching the APConf video: Go-Fed: Past, Present, and Future.
(OT: @happybeing, the end of the video also addresses extending AP to p2p environments - an area you are intested in - and also using different transports than HTTP like SSB)