Sorry, docx4j can't do this, and nor afaik can Apache POI.
The chart data is present in the package of course, but no corresponding image, so you have to generate that yourself.
Some options to explore:
1. documents4j (integrated with docx4j), but it seems some work may be required to get Excel to handle charts: https://stackoverflow.com/questions/343 ... ocuments4j
2. automate excel some other way
3. Microsoft Graph? https://www.docx4java.org/blog/2020/09/ ... x4j-8-2-3/
5. Use JFreeChart to make your own chart from the data in the package (how much work this would be depends on how many of Excel's chart types you need to support, and how closely your chart needs to match the appearance produced by Office
6. Aspose? (commercial)