Hi, if you're using a simple cloned text field, then it has only values. In this case, I think it's best to use these values as both the value and label in the options of the check box list.
You can use a snippet like this:
$settings = get_option( 'option_id' );
$values = isset( $settings['field_id'] ) ? $settings['field_id'] : array();
$options = array();
foreach ( $values as $value ) {
$options[$value] = $value;
}
// In the field
array(
// Other options
'options' => $options,
)
