Can you have Stress on a built-in watch face on Venu 3?

Oui il existe plusieurs cadran dans le store garmin IQ qui permettent d afficher la complication de suivi du stress.

Yes that's possible. 

But not all watch faces are customizable or have the stress score as a data option.

Here are some examples:

The first of the one I posted only has one customizable data field but on the remaining ones you can display your HR as well as your current stress level. 

Thank you very much.