Is there a way to set the accessibility zoom increment?

In accessibility, you can enable keyboard shortcuts to zoom, and then use Command + Option + =/- to zoom in and out. But the zoom amount is too minimal, and each time I want to zoom in, I have to press Command + Option + = + = + = or even more to get where I want to be. I'd estimate that the zoom amount for each increment is perhaps 5%, at most 10%, and I want it to be something like 20% or maybe even 30% So, is there a terminal command (I'm assuming that's the answer) to edit some internal setting to update the increment value?