There are a couple of uservoice requests about this:
https://microsoftteams.uservoice.com/search?filter=ideas&query=annotate

https://microsoftteams.uservoice.com/forums/555103-public/suggestions/40279195-the-ability-to-annota...

I think that this will come to Teams too, since it is a feature requested by users and that zoom got this feature. Teams and Zoom tends to copy features...