At the moment, if a teacher has both their teacher Chromebook and their Classroom Desktop, you can project your presentation so that both groups of students can experience and participate.
Create your zoom room on your Chromebook that your online students will come into
Join the Zoom room using the Meeting ID and Password.
Open your presentation(Google Slideshow, etc.) on your Desktop Computer
Project your Desktop computer on your projector in the classroom.
Choose the Share Screen option in Zoom on your Desktop Computer
Use your Chromebook as your camera and microphone and work through the presentation on the Desktop. Students in the physical room will see the presentation on the projector screen and online students will see the presentation in the Shared Screen on Zoom.
Check out this video to see an example of what this looks like: