Look at the app: mmhmm still in beta. You might find this useful for related type tasks.
FYI: There’s a thread on this topic:
Need to enhance your video calls? mmhmm invite only beta announced
I’m curious to check this out and added myself to the waiting list.
As I shared in the above thread, I’m also using eCamm Live Pro that, among other things allows me to share my screen (including a Keynote window) in my video feed. The downside is that Zoom’s video feeds are currently limited to 720p, unless you have a Business/Enterprise account or are using a Zoom Room and I find that the text on Keynote slides isn’t as sharp as it is when sharing the screen. Still, it’s useful in some circumstances.