Using Luna and Zoom
You can use Luna Display while on a Zoom call to extend your workspace when sharing your screen. While in Mac-to-iPad Mode, you can move your Zoom whiteboard over to your iPad and use your Apple Pencil to annotate.
Please note, that if you are sharing your screen, and then you move your whiteboard over to your iPad screen, the screen sharing will temporarily pause. You will need to click on "Resume Stream" in your Zoom control bar in order to continue screen sharing.