Once upon a time, D7 was a promising platform for linked data. Looking at D8, it would seem that most of the functionality hasn't made it to D8 and the D7 semantic web modules weren't ported to D8.
What is currently usable in D8?
I can see https://www.drupal.org/docs/7/api/rdf-mapping-api and a few projects by Martin Schauer (PoolParty) https://www.drupal.org/u/martin-schauer. Other than that?