Sync Ardour with Hydrogen?

After many nights of trying, it seems that there is no way to synchronise Ardour with Hydrogen. The current version of Ardour on a Mid 2012 MacBook Pro running OS Mojave 10.14.6. After a several installs I cannot get Jack to show up in the sound preferences - or anywhere else, i.e., on Ardour or Hydrogen. Am I missing something? Is there another way?