checkbox custom field missing label?

Dear All. A very good morning to everyone

I have just installed this great plugin and I am trying to learn it developer-wise.
I created a couple of custom fields successfully.
However I noticed that checkbox field does not print any label/title.
My code is the following:

        wpas_add_custom_field( 'confirmation',
                array(
                        'title' => __( 'Confirmation', 'wpas' ),
                        'field_type' => 'checkbox',
                        'required' => true,
                        'label'      => 'Confirmation',
                        'options' => array(
                                'accept_terms' => 'I agree to the terms of use, for the above product/service request'
                                ),
                        )
                );

After some checking I noticed that in the respective class ( /wp-content/plugins/awesome-support/includes/custom-fields/field-types/class-cf-checkbox.php ) there is no code to produce the title:

                foreach ( $this->options as $option_id => $option_label ) {
                        $selected = in_array( $option_id, $values ) ? 'checked="checked"' : '';
                        $output .= sprintf( "<div class='wpas-checkbox'><label><input type='checkbox' name='%s' value='%s' %s> %s</label></div>", $name_attr, $option_id, $selected, $option_label );

Is this a core bug or am I doing something wrong ?

I thank you all in advance

Kind Regards