How to control chart and legend height?

Hello,

I have some pie charts in a row, but with different number of elements, so their legends have different height. The number of elements is not fixed and it will be increased.

So I have two problems. First, I need to get the same chart (without legend) size. One option would be to set the legend size, but there is a problem. If I use a fixed size, some part of the legend (in the future) could be hidden. Anyway, if I don't use a fixed size, I would have a similar problem, the legend would get larger and the chart smaller.

The best solution would be to set a chart (only chart) height with a not fixed legend height, and get the total (chart + legend) height automatically set. But I think this is not possible.

Is there any solution to this?

Thank you.