Translate_Press

functions.php

add_filter('trp_hreflang', 'trpc_change_hreflang', 10, 2 );
function trpc_change_hreflang( $hreflang, $language ){

   //if ($hreflang == 'ru-RU') return false;

    $arr = [
        'ru'=>'ru-UA',
        'uk'=>'uk-UA'
    ];
    if (isset($arr[$hreflang])) {
        return $arr[$hreflang];
    }


    return $hreflang;
}

add_filter('trp_add_region_independent_hreflang_tags',function ($hreflang){
  return false;
});
/**
 * canonical rank_math Translate_Press
 */
add_filter( 'rank_math/frontend/canonical', function( $canonical ) {
    global $TRP_LANGUAGE;
    $trp           = TRP_Translate_Press::get_trp_instance();
    $url_converter = $trp->get_component( 'url_converter' );
    $canonical     = $url_converter->get_url_for_language( $TRP_LANGUAGE, $canonical, '' );

    return $canonical;
});