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In Interactive Charts, the only way to get user-defined input (other than automatic axis names etc.) into the chart is to add an additional column to the data which has the same content in each row and to use a batch chart.
I have two suggestions to this point:
I would like to allow access to global Alteryx variables in any Chart text, such as "The path is [Engine.TempFilePath]". This should also work for non-batched charts.
The current way of referring to columns in batch data is a bit odd and inconsistent to other tools. You have to type in "$" and get a list of available columns. After selecting, the dynamic test appears like static text in the configuration: If you type in "The column name is $column", you see "The column name is column" afterwards. That's quite confusing. My suggestion is to use the same nomenclature as elsewhere in Alteryx: Type in the text in brackets: "The column name is [column]". That way it would be as usual.