Encore\Admin\Widgets\Chart\Bar::add PHP Method

    public function add($label, $data = [], $fillColor = '')
    {
        if (is_array($label)) {
            if (Arr::isAssoc($label)) {
                $this->data[] = $label;
            } else {
                foreach ($label as $item) {
                    call_user_func_array([$this, 'add'], $item);
                }
            }
            return $this;
        }
        $this->data['datasets'][] = ['label' => $label, 'data' => $data, 'fillColor' => $fillColor];
        return $this;
    }