This is not currently a feature within Airflow. However, it’s one I’ve seen discussed a number of times and there is an active issue and an open pull request on the Airflow project https://issues.apache.org/jira/browse/AIRFLOW-3959 to alleviate some of the organization issue.
There is a PR to add tags that will be good. In short term, the convention is to include keyword in dag name and you can filter on that - not awesome, hence this PR.