Is there a way to globally set the format for email signatures? I'm not talking about the Global Signature that is used to put something on all emails that go out of our building that makes our legal department happy.

I was asked if there is a way to set the format, style, font, color, etc of the user information that can optionally get applied to the bottom of every email so that all signatures have the same look, style and information rather than one being in plain block letters, another being in pink fancy letters, and another being in comic-sans. The only option that I'm seeing is for the Global Signature and not the in-mailbox signature. Thanks!