Hello,
phpdocx 7.5 added a lot of improvements when working with charts and when importing HTML tables. You can read these changes on https://www.phpdocx.com/news/post/phpdocx-v7-5-release-notes/213; and you can test them using the trial package.
If you need to use advanced charts that include not supported styles/properties by addChart, the replaceChartData method available in Advanced and Premium licenses is very useful.
Regards.