Notifications - different DND for different apps

I would like to be able to set different notification times, or DND, for different apps. For example, I would like to receive notifications for my work email, Skype and WhatsApp, (all things I use for work) during work hours (8a-6p) but I would like to receive iMessage, and Facebook messenger from say 7am-Midnight. I do not think it is possible to change the DND time per app but this would be useful.