I have choropleth map with graduated colors. The column - the field name - that I choose to define the classes and the colors is important for my work on the maps. Is there a method to make it visible or refer to it at any other part of QGIS. It would be especially useful in the print composer, where I can check on other map objects and labels when I use several print composers. As far as I explored, there are only expressions to get values from the attribute table of certain layers or to get other layer properties than the style.