Sorry for my late feedback, was a crazy week.
Finally I was able to speak to my colleague and it is a bit disappointing. He told me that they mainly use Reuters for Asia markets but as we all know, it costs a bunch of money. Thus not really suitable for (small) individual investors like us.
There is indeed morningstar`s free data which @hedgehog already mentioned. Besides that he suggested the Financial Times data as well. According to a website he suggested FT is even more comprehensive than Morningstar.
Check out this website: https://the-international-investor.com/investment-faq/international-fundamental-data-price-data-foreign-stocks and scroll down to the fundamentals section. A very good market overview of good data providers (unfortunately not all for free, but also cheap solutions among them). But maybe then it is cheaper to pay for an screener which already covers these special markets.