When labeling site pavements slopes, the tool only allows for a pre-defined symbology (slope=X.XX% ->) and it`s a simple text.
We use a different symbology, basically a arrow cell and a text between the two points.
The abillity to customize the label, for it's value to be linked to the terrain and this reference terrain be exchangeable would be a great advancement for site labeling.
This type of annotation could be added to plan Civil Labelers capabilities, as of now, this is only possible in XS.