Reference setting (Chinese abbreviations and et al. questions)

When I was using CSL style editor to edit the name of Chinese authors,I couldn't modify to the correct abbreviation format. For example, The name is Yufeng Zheng, I wanted to make it show up as Zheng YF, but it showed up as Zheng Y. How can I correct it?
In addition, how can I make “et al.” italic?
Thank you for guiding.
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