Zoom Presentation where I share screen but can annotate or scribble via my tablet
Log in to the zoom meeting both from your laptop and from your tablet. Then use the annotate function on your tablet to annotate the slides which you share from your laptop.  

(You have to allow the tablet user, or generally other users, to annotate the slides, of course.  I'm not entirely sure whether you can restrict this possibility to a specific user - though you might want to try with making the tablet user co-host or the like - but on the other hand, it might have advantages if also the students can annotate your slides, e.g. in case they want to ask a question about some specific point.)

(Also, I believe you cannot log in twice with the same account - but you don't even need an account on the tablet, or otherwise you can create a second account.)