How to get the Form post data on custom button click in magento2

Question

I have created a custom button in UI component magento2 I want to have post data ( id ) on button click in controller

Button in UI Component

<item name="combinations" xsi:type="string">Vendor\Module\Block\Adminhtml\Form\Buttons\CombinationButton</item>

Block

class CombinationButton extends GenericButton implements ButtonProviderInterface
{
 
    /**
     * @return array
     */
    public function getButtonData()
    {
        return [
            'label' => __('Generate Combinations'),
            'on_click' => sprintf("location.href = '%s';", $this->getUrl()),
            'class' => 'action-secondary',
            'data_attribute' => [
                'mage-init' => [
                    'buttonAdapter' => [
                        'actions' => [
                            [
                                'targetName' => 'hairforadmin_formula_form.hairforadmin_formula_form',
                                'actionName' => 'generatecombinations',
                                'params' => [
                                    false
                                ]
                            ]
                        ]
                    ]
                ]
            ],
            'sort_order' => 100
        ];
    }
 
    /**
     * Get URL for back (reset) button
     *
     * @return string
     */
    public function getUrl()
    {
        return $this->getUrl('*/*/generatecombinations');
    }
}

Controller

class GenerateCombinations extends Action

{

private $modelFactory;

public function __construct(Context $context, FormulaFactory $modelFactory)
{
    $this->modelFactory = $modelFactory;
    parent::__construct($context);
}

public function execute()
{
    $id = $this->getRequest()->getParam('formula_id');

    echo "<pre>";
    print_r($id);
    exit;
}
}