Hello,
You need to install tidy to transform HTML to DOCX. You can also use addText to insert strings:
$html = '<p>Character ● other</p>';
$docx->embedHTML($html);
$text = 'Character ' . html_entity_decode('●') . ' other';
$docx->addText($text);
The dot character can also be added directly instead of the encoded value.
Regards.