stemcell/app/code/WeltPixel/Backend/view/adminhtml/templates/helpcenter/init.phtml

<div>
    <input type="hidden" name="wp_base_url_jscolor" id="wp_base_url_jscolor" value="<?php echo $this->getViewFileUrl('WeltPixel_Backend::jscolor'); ?>" />
</div>
<script>
    requirejs(['jquery' ],
        function ($) {
            $(document).ready(function() {
                $('.item-weltpixel-helpcenter a').attr('href', 'https://support.weltpixel.com/hc/en-us').attr('target', '_blank');
            });
        });
</script>