Is it okay for a teacher in the calligraphy department of Taizhou University?

No, the main function of calligraphy graduation is to write beautifully, nothing else. It is also obvious that Chinese teachers need a high language foundation, not only to write beautifully, but also to choose words and sentences, to know pinyin, to teach students to write compositions and to change their homework, mainly the standard of Putonghua. Your major is not teaching Chinese, so you can't teach Chinese.