Yes, you can choose to target power or heart rate.
I haven’t included an upper zone limit because if 4 out of your 150 minutes were at VO2, I’d say you would still have achieved your workout goal - and then some.
I should mention that the app doesn’t do everything for you. You still need to try to keep a steady pace, and make your work segments as long as you can. The app will allow you to do 1 minute on and off for 300 minutes, but you would be cheating yourself if you did that 