I'd like to create kind of a baseline in my chart, where there a multiple columns, and a horizontal line of value "1", which starts at the y-axis and goes beyond the last column. See this example:

![enter image description here](https://i.stack.imgur.com/Bp7Q0.png)

Now, I have created something similar, but it's not yet succeeded:

![enter image description here](https://i.stack.imgur.com/HS8Gr.png)

The series code is simple:

```
            series:
            [{
                type: 'column',
                data: [4.05,2.81,2.1,1.20,0.37]
            },
            {
                type: 'line',
                name: 'Globale Biokapazität',
                data: [1,1,1,1,1]
            }]

```

Is there any parameter I can set to extend the line? Or is there any other way to highlight a line?

Thanks for any hints!