Is it possible to set a customizable mode of "Do not disturb" for Outlook? In this article, it is described how to set Outlook to e.g. do not disturb during weekends. 

In addition to this, I would like to add the criteria to not disturb after work hours (i.e. 5 PM to 8 AM).

From my understanding, this is not possible? Could we persuade Microsoft to add this feature somehow?

EDIT: I found that several others also want this feture.
The latest versions of the Outlook app actually already have this new DND option "During evenings" wherein you can configure your after-work routine. By default, it is set to 5PM to 8AM schedule as you want in your question. But it can also be modified to fit a different routine. Here's the screenshot: