You have this option with the minor contours up to every 0,125 m.
Merge the minor and major contours shapes in a GIS application (e g QGIS) and edit the attributes (as minimum option: FONT). You also can only edit the minor contours but if you merge, you directly can see the differences.
But there is a problem to show more than 1 decimal place - the IMC will round (.25 => .3 / ,75 => .75). You can change this, but this is much more effort.