Treshold line in combined chart

[ivuceticll]

Please can you help me, how I can set threshold line in combined chart. I have two column chart and I want to show threshold line, or is it possible to change guideline just on one line ?

[patrickmichalik]

Hello! Just like ColumnChart and LineChart, ComposedChart extends BaseChart. Thus, it has the addDecoration, setDecorations, and removeDecorations functions.