Help with – yith_wcan_query_vars_to_merge

Hi.
I need make 2 pages in store – men and women, with selection of goods by gender. On page for women – displayed only goods for woman and filter should apply this by default. I found hook in your plugin that should suit me – yith_wcan_query_vars_to_merge?

/**
* APPLY_FILTERS: yith_wcan_query_vars_to_merge
*
* Filters list of query vars to add to the query. - Фильтрует список переменных запроса, которые можно добавить в запрос.
*
* @param array $query_vars List of query vars
*
* @return array
*/
	$query_vars = apply_filters( 'yith_wcan_query_vars_to_merge', $this->get_query_vars() );

Can you explain in what format the query parameter should be passed so that the hook works correctly?

// Insert in function.php
function modify_start_param_yith_wcan( $this->get_query_vars ) {

    if ( $this->is_main_query() && $this->post_type = 'product' ) {

        if(isset($_GET['female'])) {
			$this->query_vars = array(
				'key'           => 'gender',
				'value'         => 'women',
				'compare'       => '=',
				'type'          => 'string'
			)
		}
	};
	return $query_vars;	
}

add_filter('yith_wcan_query_vars_to_merge', 'modify_start_param_yith_wcan');

Will this be correct?

Thanks in advance for your reply.