add custom menu to account page

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

function add_custom_account_menu( $enpoint ) {
    $enpoint['custom_account_menu'] = array(
        'slug'  => 'custom-menu',
        'label' => 'custom_menu',
        'title' => esc_html__( 'Custom Menu', 'jnews' ),
    );
    return $enpoint;
}