How to enter Mandarin Chinese characters in texts?

Hi, I’m using /e/ OS in Bulgarian language. I would like to enter Simplified Chinese in addition to Bulgarian and Latin. How do I do that?

I added Chinese as language, but when I try to add a keyboard layout, I see only Bulgarian. Why?

Thanks a lot.

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I just discovered I can add Chinese input methods by installing an additional app: Chinese Pinyin. This answers my own question.