I am sorry I don't have much time to use gog, so I can only make some suggestions here.
I suggest you add them one by one according to the sales volume of the games. For the sales data, I recommend you publish the annual sales volume list of domestic single machines according to the chinese video games sales【国游销量】 (but the English font is too small). Maybe there are more high-definition pictures on social networking sites or video websites.
If you are interested in high-quality games, you can take a look at some special support projects, such as Sony China hero project (chpj) or Tencent's wing project.
If visual novels are added, vndb.org and cngal.org are useful.
That's about all I know.
Or you can find a Chinese game developer on the social networking site and look at the accounts he cares about. Maybe you can find something.

https://asia.playstation.com.cn/en-cn/hero/
https://www.bilibili.com/read/readlist/rl54275 （Bilibilibili account of chinese video games sales）

很抱歉我用GOG的时间不多，只能在这里提一些建议哈。
我建议您根据游戏销量挨个添加，关于销量数据我推荐您根据国游销量发布的销量年榜国产单机销量榜（但英文字体太小了），也许在社交网站或视频网站上有更高清的图。
如果您对高品质的游戏感兴趣的话可以看一下专门的一些扶持项目，例如索尼中国之星(CHPJ)或腾讯的翼计划。
如果再加上视觉小说的话，vndb和cngal都有用。
我知道的差不多就是这些了。
要么您去社交网站上找一个中国游戏开发者，把他关注的账号看一遍，没准真的能发现些什么呢。