I'm trying to remove column names from the grouped list. I followed the instructions given here: SharePoint Online list - format group headers to remove column name but I seem to have another issue.
I use project names that come from another sharepoint list. With the original JSON I got Object Object instead of Project name.
When I replaced @group.fieldData.displayValue with @group.fieldData.title however, it just returned blank for me as in 'black space (26)'. Any ideas? Thank you!