Tranlation Fields

Hi,
I currently use Polylang plugin for a multi-language website.
Additionally, I use your plugin with which I have created some custom fields.
The problem is that I have managed to translate the labels of each custom field, but not the value.
I used this code for translate Back Office values, but not work…

add_action('init', function () {
	foreach (acf_get_field_groups() as $group) {
		$fields = acf_get_fields($group['ID']);
		if (is_array($fields) && count($fields)) {
			foreach ($fields as &$field) {
				pll_register_string('form_field_group'.$group['ID'].'_label_'.$field['name'], $field['label'], 'acf_form_fields');
			}
		}
	}
});

add_filter('acf/prepare_field', function ($field) {
	if (!is_admin()) {
		$field['label'] = pll__($field['label']);
	}
	return $field;
}, 10, 1);

For example: I have the Modality field, and this can be online or offline. Modality I can translate it as string in Polylang but not their value.
Is there any solution for this case?
Thank you very much and greetings,