Yes! Screen sharing can be done during a session by either the provider or the client. To share your screen, start your session as normal and then click the green button at the bottom of the screen that says "Start Screen Share". Note that screen sharing from an iPhone or iPad is not supported.
When you click that button, a screen will display options of what you would like to share specifically. Most people just choose their entire screen which is always the very first option.
On newer Mac devices, go to Apple icon>Preferences>Security and Privacy and make sure you add Chrome here.