Display Connect IQ data fields as Custom Data on any of the basic Garmin watch faces

In the Connect IQ store, I downloaded and setup a data field for "NightScoutData2." I was able to get that data field to display during an activity, such as biking or walking, which is great. However, in the Garmin Connect app, when I modify the Appearance > Watch Faces for my device (Vivoactive 4S), the Connect IQ data field (NightscoutData2) doesn't appear in the pulldown list of options to display as Custom Data.

Is it possible to display Connect IQ data in standard Garmin watch faces?