//  /app/Livewire/CustomPage.php

public function getHeaderWidgets(): array
{
  return [
    ExampleOverview::make([
      'foo' => $this->foo ?? [],
    ])
   ];
}

public function refresh(): void {
  $this->foo[] = 0 // New data chart
  $this->dispatch('update-foo');
}

//  /app/Livewire/CustomPage.php

public function getHeaderWidgets(): array
{
  return [
    ExampleOverview::make([
      'foo' => $this->foo ?? [],
    ])
   ];
}

public function refresh(): void {
  $this->foo[] = 0 // New data chart
  $this->dispatch('update-foo');
}

//app/Livewire/ExampleOverview.php

class ExampleOverview extends BaseWidget
{

    public array $foo = [];

    #[On('update-foo')]
    protected function getStats(): array
    {
        return [
            Stat::make('','')
                ->chart($this->foo)
        ];
    }
}

//app/Livewire/ExampleOverview.php

class ExampleOverview extends BaseWidget
{

    public array $foo = [];

    #[On('update-foo')]
    protected function getStats(): array
    {
        return [
            Stat::make('','')
                ->chart($this->foo)
        ];
    }
}