You can add character columns or character string columns as labels to the Line chart tile type, which are specified in the list of available columns. Select the columns as you would select other numerical columns to add them to the line chart.

In the signal settings for the text signals, you can also use the Ident style field to specify how the text signal is displayed: as a speech bubble, as a label at the start of a section or both.

Text channels from DAT files can also be used as text labels in the line chart.

The number of labels displayed is set to a maximum of 50 text labels per selected column or signal. No labels are displayed in the chart if the currently applied dashboard filter outputs more than 50 values.