Mac OS mail app: Customize print margins + print only selected content

When I print a message, Gmail allows to fully customize the print margins size. It also allows to print only the selected content, instead of only the full message.

I recently started using the Mac OS mail app. To my surprise, it apparently doesn't support custom margins, and it crops charts/images that could perfectly fit with smaller margins. It also doesn't allow to print a selection only, forcing me to print useless signatures and previous emails.

Am I missing something? Is it a limitation of my printer's driver, or Apple completely missed such obvious features? Is there a trick (via terminal or script) for reducing those ridiculous 1-inch margins?

Please don't suggest to scale down the print so the charts fit. It is pretty silly to have to use a magnifying glass while having all that blank space around...

Please help.