RIR Spot Coordinate

Hi.. I’m adding to a simple section some dimensions and coordinates.
The solid is made as a loft between two sections (initial and final… section could be variable…not this case)

I’ve done a section “A” of the solid at a certain distance along the aligment…
How can I place the sport coordinates in the section… I got errors when putting references in the “add spot coordinate” node….
I can easilly got insertion points by cutting the brep… what about references?

Thanks

@RGTekla Please check the following video