How can I get single keys in multi-item config objects using debug:config? For example, in drush I can run 

drush cget search_api.server.iges_solr backend_config.connector_config.port

and get a useful answer.  

('search_api.server.iges_solr:backend_config.connector_config.port': 8988)

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?
No, Drupal Console doesn't support selecting a key from a configuration object. This is clear from drupal help debug:config which even mention grepping.

Using grep isn't beautiful, but it works:

drupal debug:config system.date | grep -A1 timezone


does return the timezone with the first subkey. (Changing the value after A, you get more lines/the user subkey.) 

I would of course prefer to get the configuration object as proper JSON and then pipe it to jq to select a key robustly, but Drupal Console doesn't support an output format option yet - see Github issue.