That's the neat part. You don't!
Seriously though, if its in a separate user profile or a work profile you won't get any notifications unless it's active. The simplest solution is to use something like Shelter to get create a work profile. Put G services in that and WhatsApp and anything else. Then you can pause the whole profile when you don't want it running, and G can only see what's in that profile. This is what I do and I keep it paused 99% of the time.