turn down / off backlight during activity?

[akgakgakg]

Hi! GREAT app. Is there any chance that it could default to (or have an option for) turning the backlight on the watch face down / off while the activity is underway? On my device (vivoactive 4) the screen is on and bright the whole time, and there doesn't seem to be a way to turn it off. For me it's unnecessary, somewhat distracting, and prob a battery drain in longer-duration activity. THANKS!