code: @Programmatic
      public CommunicationChannelOwnerLink findByCommunicationChannel(final CommunicationChannel communicationChannel) {
          return repositoryService.firstMatch(
                  new QueryDefault<>(CommunicationChannelOwnerLink.class,
                          "findByCommunicationChannel",
                          "communicationChannel", communicationChannel));
      }
docs: region > findByCommunicationChannel (programmatic)