In theory you could rasterize and center the result in the box. In practice, good luck accounting for how ascenders and descenders alter the visual balance to m

In theory you could rasterize and center the result in the box. In practice, good luck accounting for how ascenders and descenders alter the visual balance to make something that feels "right". I've spent way too much time fiddling with borders on my photos, I don't want to imagine working with something so unruly as text!