Hi hkam,
You can do this from:
1- Setting (in Toolspace) > Alignments > Label Styles > Tangent Intersection
2- Right click (Expressions) > select New, and give it a name, inside Expression area paste this line >
{PI Extended Raw Station}-{Curve Start Station} , and ok.
3- Now select your alignment > add labels (at Top left) > add Alignment labels > select :
Feature > Alignment
Label type > Point of Intersection
Point of intersection label style > Create new (Give it name)
4- From Layout tab > General (Give it name), Text > Contents > select (Three dots) on right, delete everything on right screen first, on the left from the properties list select the name you typed in step 2 (Don't forget the insert arrow), make your setting and save
5- Now select the curve you need to add that distance
Hope it was useful.