I have a work email and a personal email logged in using the Gmail app from the Google Play Store. Within the Gmail apps notification settings in one UI, there is in fact the option to enable and disable notifications for each individual account that is signed in with the app. However when making app exceptions through the do not disturb interface in the system settings, there is not an option to enable just certain categories or certain accounts within an app. Only the whole app. I have heard that Pixel users have this option, so clearly it is codable. 

(Couldn't find a spot to post a suggestion except in the One UI beta area and it was not allowing me to post there)