The answer is yes, in theory, with CSS, but in practice, I don't think any reading systems support it.
Code:
@page {
@top-center {
/* content: element(header); */
content: "This is a test.";
}
}
And it is probably a good thing that they don't support it, because I accidentally left the markup above (complete with "This is a test") in some books that I shipped.