
I don't find such script to set Edge zoom level. For your demand, I think there're two options you can try.
Option one:
You can set zoom level in Edge Settings-> Appearance-> Zoom-> Page zoom like below. You only need to set it for once in Edge, then it will work all time.
Option two:
You can add --force-device-scale-factor=1.25
at Edge shortcut Target like below, then it will work when you start Edge. It's a little different than zoom 125%. It not only zooms the webpage to 125% but also zooms browser UI to 125%.
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Regards,
Yu Zhou