Change legend labels text color according to dark/light theme

[davide-granello]

Hello, i want to change the legend labels text color according to the theme.
I'm currently setting the color like this:

public function configure(NovaRequest $request): void
  {
    // ... other settings
    
    $this->legend([
      'position' => 'left',
      'labels' => [
        'color' => 'rgb(148,163,184)' // static value not linked to current light/dark mode
      ]
    ]);
  }

A ChartJsWidget class variable like $themeColor would be useful in order to change some settings depending on that.