How to put the spec (or other PCF fields) in the continuation annotations in the iso

In the isoconfig.xml add the following:

 <EndConnectionScheme Name="EndConnectionsTo" AnnotationStyle="Standard" Format="FORTS. AUF\PDWG#\P{0}\P{1}\P{2}" LeaderStyle="AlwaysCorner" Filter="EndConnectionsToRefNotNull" Fields="REFERENCE-TO CO-ORDS PIPING-SPEC" />
 <EndConnectionScheme Name="EndConnectionsFrom" AnnotationStyle="Standard" Format="FORTS. VON\PDWG#\P{0}\P{1}\P{2}" LeaderStyle="AlwaysCorner" Filter="EndConnectionsFromRefNotNull" Fields="REFERENCE-FROM CO-ORDS PIPING-SPEC" />

Resulting annotation will be like this

If you need other information in your label, check your PCFs for the according string.