We're open to that possibility. We know the broad idea we want to apply with schema extensions, but we're still figuring out the right DX on the execution.
I'd love to know how Gargron (mastadon author) feels about json-ld.
Im just the peanut gallery but json-ld is pretty nice. Give people the right "context" & they can basically ignore that they're working woth json-ld, in a wide range of cases. But get real extensibility & interop with the other semantic web things.
Of course, writing maintaining & using the translators to flop between forms is more work!