From internal discussion at https://goto.google.com/gsuite-chrome-print-settings-thread

GSuite would like to be able to supply the initial value for various print testtings.  Paper size is already discussed in issue 238303.  Also desirable are:

 - headers and footers (sometimes influenced already by "@page {margin: 0}"
 - margins
 - scale

If we need additional CSS APIs, I can help find someone from the platform/standards side to help.