Thank you @bjrmatos, and thanks too for the advice of inspect with the browser tools.

I'm using jsreport via HTTP requests, is there a way to specify pdf-utils settings from a http request to a jsreport server? I'm using chrome-pdf recipe and I need this because I need to center a pdf header but native headers css text-align: center; don't center the content of headerTemplate.
Any ideas or I'm missing something?