Chinese mods often come in .7z or .rar archives. Use 7-Zip or WinRAR to open them.
This is perhaps the largest repository for Chinese mods. You can find everything from character replacements to gameplay overhauls. Search Term: 龙珠：超宇宙2 MOD dragon ball xenoverse 2 chinese mods link
The Chinese modding community primarily operates on large gaming hubs and specialized forums. Because these sites are in Mandarin, using a browser with a built-in translator (like Google Chrome or Microsoft Edge) is highly recommended. Chinese mods often come in