Referring to this new tool : https://www.esri.com/arcgis-blog/products/arcgis-pro/mapping/graphical-cartograms-in-arcgis-pro/
I was able to use the tool to easily create a cartogram representing a certain value for a set of census areas. However, the resulting cartogram's attribute table only contains the standard fields (ObjectID, Shape, Length and Area) and the value I used to size the symbols (rounded to integer). This means there is no way to then colour the symbols, either by an attribute that already exists, or by using a table join to bring in external data.
The example in the blog article implies that some additional information was included when the cartogram was created, if only to colour the circles red or blue.
Can I keep more than one attribute for my cartogram symbols?