For example, in drush I can run
drush cget search_api.server.iges_solr backend_config.connector_config.port
and get a useful answer.
In Drupal Console, I've tried the same formatting as in the drush command, I've tried a colon between the main config item, and the sub item
drupal dc search_api.server.iges_solr:backend_config.connector_config.port)
I've tried a fair number of other things, and I've read the docs to no avail. Is it possible to do without just grepping?