Ghost
https://ghost.org/docs/concepts/features/#search-engine-optimisation
But it sounds like you are looking for a custom Ghost Admin that would
query Wikidata wherever you used it's dynamic menu via typing `/` on a new
line or just adding a new button on it's Ghost Admin editor toolbar so that
when you highlight a word you would be given an option to do a Wikidata
search that would then embed a
https://schema.org/sameAs statement or
multiple other kinds of statements via a form to fill (in general, you can
think of this as a custom link helper that optionally doesn't produce a
link element but instead embeds the structured data).
Details:
https://ghost.org/docs/concepts/admin/#best-in-class-editor
https://ghost.org/docs/concepts/posts/#writing-experience
https://github.com/TryGhost/Ghost/blob/master/core/frontend/helpers/link.js
Someone in the Ghost community could probably write a plugin or customize
the Ghost Admin for you fairly easily to give you that feature. Ghost is
all Javascript. ;-)
Mediawiki
The alternative is indeed, running a Mediawiki morphed into a blog.
https://www.mediawiki.org/wiki/Extension:BlogPage
https://www.mediawiki.org/wiki/Extension:Wikilog
there might be more or other caveats, so others in the community might help
you regarding those or extending Mediawiki.
Good job by the way on all that research you did!
Thad
https://www.linkedin.com/in/thadguidry/