How to dimension a slot in a drawing?

Slot Dimensions dimension slot slot=icon-only name=heart>ion-icon> ion-button> ion-button shape Content is placed between the named slots if provided without a slot end dimension a slot The first slot dimensioning method provides the width and the distance between the end radii center points Dimensioning Method Method (

dimensioning a slot or if not, what is a better way to make the callout? Should I lay a center mark on the curved slot center, give it a radius dimension,