How to change the font style of Latin characters in title list and abstract?

I've played with Config Editor for hours and made the font style of Chinese characters in title list and abstract to serif by changing these flags:

font.default.zh-CN: serif

font.name.serif.zh-CN: Source Han Serif SC
font.name.serif.x-unicode: Source Han Serif SC
font.name.serif.x-western: Source Serif Pro

After the changing, the title list and abstract are mixed with serif Chinese characters and sans-serif Latin characters. The styles for x-western and x-unicode are serif by default. But they are actually rendered in san-serif.

And I don't know the meaning of these flags:
x- prefix
font.name-list.

I didn't find a detailed document for these flags, and find nothing searching in source code.

Any ideas?
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