<?php
require __DIR__ . '/vendor/autoload.php';

use PhpOffice\PhpWord\Element\Section;
use PhpOffice\PhpWord\Element\TextRun;
use PhpOffice\PhpWord\Shared\Html;
use PhpOffice\PhpWord\TemplateProcessor;

$templateProcessor = new TemplateProcessor($filename); // file containing only the text ${test}
$html = '<p><span style="background-color: #ff0000;">BugTracker X</span> is ${facing1} an issue.</p>';
$section = new Section(0);
Html::addHtml($section, $html, false, false);
$templateProcessor->setComplexBlock('test', $section);
$facing1 = new TextRun();
$facing1->addText('facing', ['bold' => true]);
$templateProcessor->setComplexValue('facing1', $facing1);
$outputFile = 'anything';
$templateProcessor->saveAs($outputFile);