Hello,
You can use the getWordStyles method to get content styles, but this requires parsing the information returned by this method.
To apply or mix placeholder styles with new content when using template methods, the best approach is to use the stylesReplacementType option available in the replaceVariableByWordFragment and replaceVariableByHTML methods. This option allows placeholder styles to be automatically applied and combined during replacements. As detailed in the documentation, this option is available only with a Premium license. You can upgrade to Premium on the "MY PHPDOCX" page after logging in.
Regards.