Magic Labels does not only help with creating labels manually, it also comes with automation. It is able to automatically inherit labels from parent to child pages. This means, that every label, which is added to a page will be added to every page below.
To activate this option, you need to configure it in the App Settings under ‘Space Settings’ -> ‘Integrations’ -> ‘Magic Labels Settings’. If you’re in the Settings you can also use a Blacklist of labels, so that your space is safe from swear words and other unwanted labels.