Button delete

[Nocebo]

$fields_form = array(
            'form' => array(
                'input' => array(
                    array(
                        'type' => 'file_lang',
                        'label' => $this->getTranslator()->trans('Image', array(), 'Admin.Global'),
                        'name' => 'image',
                        'required' => true,
                        'lang' => true,
                        'desc' => $this->getTranslator()->trans(
                            'Maximum image size: %s.',
                            array(ini_get('upload_max_filesize')),
                            'Admin.Global'
                        )
                    ), 

Hello,

I would like to add a button to this code to delete the image, but I do not know how to do it.

thank you in advance for your help