Secondary y-axis on charts field

Oh, now I can add that secondary axis, but in very specific conditions.

It would be good if:

1. I could had several columns, and just the last one into the secondary.
At the moment it's mandatory to have just two columns, where the first goes to axis1 and the second goes to axis2

2. I cloud have a distinct chart type for the secondary axis, e.g., bars for the axis1 and line for the axis2
At the moment, it's the same chart type for both axis

Anyway, thank you very much for your kind reply.

Do you think it will be possible to achieve the previous 1. or 2. good-to-have stuff?

thanks.

@jrochate can you open two separate feature request issues for point 1 and 2?