View email in both parent and nested label

Is there a way in Gmail to make the emails be viewed in the parent label? For example, in the following hierarchy:

alerts
alerts/service1
alerts/service2

The emails that have label 'alerts/service1' will also be shown when viewing emails with 'alerts' label, and ditto for emails with label 'alerts/service2'

I can set my filters to also apply the 'alerts' label, but this will clutter the labeling of all these emails ('alerts' and 'alerts/service1' will both be shown).