How can I remove "Dark Mode" from MS Office apps without disabling it on MacOS?

I am using macOS Mojave and have set Dark mode as the default setting in Apple> System Preferences> General.

I recently updated MS Office on my Mac, and the latest MS Office update (version 16.20) supports Dark mode. Unlike many other apps, this look, however, can not be enabled / disabled in the app itself.

Since I prefer the familiar appearance of my MS Office apps and still want to use the dark mode within macOS, how can I achieve this result?