How to label mileposts stacked vertically?

Question

I'm trying to label DOT mile marker points where the label is stacked vertically in the same way you would see them along a highway.  The style exists but I can't figure out the labels.

KyleGonterwitz · Accepted Answer

label the first character of the milepost string, then label the second character on the next line, third char on the next line, like so:

Layers/KDOT_reference_post_markers (MapServer)