How to apply gradient on the opposite side of the Line chart?

### Feature Proposal

I can only apply the gradient below the line.

Currently the Line chart looks like this:

#### What is the expected behavior?
The gradient appears on the opposite side of the line, meaning from the line to the top of the chart.

And I want to make the gradient like this:
(so it appears where I have drawn white lines, so it is inverted in relation to the line)

### Possible Implementation

_No response_