Hi @rgarner , thanks for your comments.
Unfortunately not. In order to get specific functionality (like trainer control & power match), it needs to be a ConnectIQ app, not just a data field. Yet when a Garmin App is running, pretty much all other features on the device are unavailable 
.
We have provided an update so that Xert workouts can be exported directly to Garmin Connect (and can be synced to your compatible Garmin device). There are some limitations there (see the thread above), but that might be an alternative option if you wish to still access things like navigation or your own custom data screens while doing a workout.
Cheers!