Thank you for reaching out to the Zoom Developer Forum. Currently, the Web SDK does not support Viewing Participants as an Attendee nor does it support private chat between attendees when in a webinar.
If you would like these features to be considered for a future release, I recommend posting in the #feature-requests category.
Thank you for your response. It looks like the Web SDK is lacking a few features that would be nice to have. I will make sure I ask for them in the feature requests.