'How to set slide zoom scale in a presentation generated by python-pptx

I've been generating some presentations using python-pptx, following a certain template. My boss wants the generated pptx and the template to be identical, including slide zoom scale. However, the template slides have a zoom scale of 74% while default zoom scale from python-pptx is 70%.

Is there any way to do this?

Something like

for slide in prs.slides:
    slide.zoomscale = 70


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