Thank you for this suggestion. I just realised, that texlive install on macOS has this Noto font. The examples on Google of this font are beautiful. But applying `usepackage{noto}` makes my multi-language document so ugly, that I prefer to stick to LaTeX with the default fonts of scrartcl with Cyrillic without bold characters.
What do you mean that your document becomes ugly when you use Noto?
When you don't use postulated you should probably not use `\usepackage{noto}` but have the Noto fonts you want to use installed as system fonts and load them through fontspec, either in your custom template or through Pandoc's `mainfont` and `mainfontoptions` etc. variables.
If your output still looks wonky that is a problem which should be solved!