I just discover that you could use Transverse alignement to annotate cross slope!
You just need to have alignements (only alignement, its not working with linear feature) with profiles (proposed or existing) and linear 3D annotation groups and you can have result like this:
all dynamic, so if you change your profiles all the slopes updates!
yes, correct. elements have profiles and their representation in 3D space, but labels works in 2d space.