That is already possible:
- top@ascender*1.1
- center@capheight*0.8
- center@centerX*0.2;maxY
(maxY, minY, centerY, maxX, minX, centerX, width, ascender, capheight, xheight, baseline, descender)
You can combine two with math and separate the X and Y with semicolon.
I fixed an issue with “xheight” and “capheight” a couple of days ago. Will work with the next update.
And auto alignment for anchors is an interesting idea.