Define color palette

### What feature do you want to see added?

For csv data, no color can be added.
The plugin use aleatory colors.
It would be good to choose a palette and colors are assigned by alphabetical order (or item apparition order).

Currently, the same report use aleatory colors (sometimes it's beautifull, sometimes, I hate choosen colors)

I can define color palette

### Upstream changes

_No response_