How to Populate the Custom Taxonomy Select Box

Hi,
First of all thank you for publishing wonderful add-on of Contact Form 7.

I followed your approach and achieved quite a lot but stuck with one thing.

I have a select box of custom post type and I am populating it by using contact form 7 hook and It list all of its option names & values.

Now I have another select box of custom taxonomy which will show options on the selection of custom post type value.

I am not sure which hook of contact form 7 I will use to populate the options of custom taxonomy.

This is my code for your reference.

add_filter( 'wpcf7_form_tag', array ( $this, 'ses_add_nmn_country_of_nomination_to_contact_form' ), 10, 2);

add_filter( 'wpcf7_form_tag', array ( $this, 'ses_add_nmn_award_category_nomination_to_contact_form' ), 10, 2);

public function ses_add_nmn_country_of_nomination_to_contact_form( $tag, $unused )
    {   
        if ( $tag['name'] != 'nmn_country_of_nomination' )  
            return $tag;
        
        $args = array ( 'post_type' => 'idcdx_country',
                    'numberposts' => -1,
                    'orderby' => 'title',
                    'order' => 'ASC' );
        $country_list = get_posts($args);
        
        if ( !$country_list )
            return $tag;
        
        foreach ( $country_list as $country ) {
            $tag['raw_values'][] = $country->post_title;
            $tag['values'][] = $country->ID;
            $tag['labels'][] = $country->post_title;
        }
        return $tag;
    }

public function ses_add_nmn_award_category_nomination_to_contact_form( $tag, $unused )
    {   
        if ( $tag['name'] != 'nmn_award_category_nomination' )  
            return $tag;
        
        $terms = get_terms(
            array(
                'taxonomy' => 'idcdx_category',
                'hide_empty' => false,
            )
        );
        if ( ! empty( $terms ) && ! is_wp_error( $terms ) ){
            foreach ( $terms as $term ) {
                $tag['raw_values'][] = $term->name;
                $tag['values'][] = $term->term_id;
                $tag['labels'][] = $term->name;
            }
        }
        return $tag;
    }

Do you mind to help me out sort out this problem.

Thanks in Advance