Members list into dropdown on form

Is it possible to create a dropdown menu made up of members so the admin can echo form variables to specific chosen member page?

How? please


public static function getSiteUsers($group = null) 
    $app = Application::getFacadeApplication();
    $user_list = $app->make(UserList::class);
    $site_users = array('');
    $users = $user_list->getResults();
    if (!empty($users)) {
        if (!empty($group)) {
        foreach ($users as $user) {
            $site_users[$user->getUserID()] = $user->getUserName();
        asort($site_users, SORT_LOCALE_STRING);
    return $site_users;


<div class="mb-3">
    echo $form->label('site_user_id', t('Site User') . '<span class="text-danger fs-6 ms-3 text-opacity-50">' . t('Required') . '</span>');
    echo $form->select('site_user_id', $site_users, $selected_site_user);