How to set a specific name to a CAPTION of a label

You can tweak the caption with the style.grass file.

See:

which will contain things like this (below). The caption field is the one you want.

node.Category {
  color: #569480;
  border-color: #447666;
  text-color-internal: #FFFFFF;
  caption: "{Name}";
  diameter: 80px;
}