Yes, it works. Thanks, Martin.
I found 19 lines with missing tag values in the first file I tried it on. If the tag is missing a value the pivot doesn't show the correct value.
I use the tags with --pivot <tag_name> on an account. Instead of adding more accounts, just add a tag and use --pivot.
If I use it when I declare an account or a tag (check), I don't have to remember to add it on the command line.