It would be useful to be able to choose a vertical alignment (relative to the y offset) for text added using images.Text. This becomes useful in the following scenarios when the number of lines of text is not fixed.

• Centering text vertically.
• Creating an Open Graph image with a subtitle at a fixed distance below the title. This can be achieved by making the title "bottom" aligned and the subtitle "top" aligned and having the same y offset for both texts.

It is not currently possible to implement these using only the y option which sets a vertical offset for the top of the text relative to the top of the image.

Vertical alignment would complement the horizontal alignment feature (alignx) mentioned in #10849 and added in #13223.