How do you make your camera look downwards but you can still zoom in and out?

Hi, I am trying to make a a Tower Defense game similar to "Bloons TD 6," so that your camera is looking down at a specific height (that I can change in the code). There is another thing that I want to implement which where you can also zoom in and zoom back to the original height.

Can this be done? Also I appreciate anyone that tries to help :)