How can I fill a shape in Radar Chart?

I'm struggling to find a way to just fill one shape in a radar chart. An example of what I would like to have is in the image.

• I tried to start from a simple radar chart and then filling the shape --> I can't find the option;

• I tried to start from a filled radar chart, but I don't know how to obtain the result in the image;

Thank you.

Is there a series data for the filled shape in Radar Chart?

If not, please add an auxiliary column to draw the line for this filled shape.

Then create a Radar Chart includes the series of auxiliary column.

And then select this chart > Recommended Chart > All Charts tab > Combo > Choose Filled Radar for the series of auxiliary column. Choose Radar for another series > OK.

If you need to show markers you may add it.