Using web map layer attributes directly in comparison reports is not currently supported due to some technical limitations. The recommended workflow is to create a custom data with your map layers and use the variables in comparison reports.
@FasilTiru thank you for this suggestion. I considered custom data but I don't want the data to be aggregated and I can't seem to find a way to turn off aggregation when configuring a custom data variable. Is there a way to accomplish this?
