add custom menu to my account page

add_filter(
    'jnews_account_page_endpoint',
    'add_custom_account_menu',
    99
);

function add_custom_account_menu( $enpoint ) {

    /* add custom menu on account menu item  */
    $enpoint['custom_account_menu'] = array(
        'slug'  => 'custom-menu',  /* custom menu slug */
        'label' => 'custom_menu',
        'title' => esc_html__( 'Custom Menu', 'jnews' ),  /* custom menu Title */
    );

    return $enpoint;
}


add_action( 'jnews_account_right_content', 'custom_account_menu' );

function custom_account_menu() {
    global $wp;

    if ( is_user_logged_in() ) {
        if ( isset( $wp->query_vars['account'] ) && ! empty( $wp->query_vars['account'] ) ) {
            $query_vars = explode( '/', $wp->query_vars['account'] );

            if ( 'custom-menu' === $query_vars[0] ) {
                $render_page = 11818;   /* change with  your custom page ID */
                $page        = get_post( $render_page );

                if ( $page ) {
                    echo apply_filters( 'the_content', $page->post_content );
                }
            }
        }
    }
}