Does learning Japanese have an impact on employment in calligraphy majors?

No.

First, my country’s general college entrance examination allows you to choose three foreign languages, English, Japanese, and Russian. Second, since most candidates choose English, some ordinary universities restrict "certain majors only recruit English candidates" for the convenience of teaching. In this case you'd better not apply. Third, candidates who actually choose English can also apply for Japanese majors. However, if some majors restrict the admission of only English candidates, then you should not force it, because since the school stipulates this, it must be due to its own conditions and cannot provide separate admission to students. There is a Japanese teacher, and even if you go, you will be the one affected. Fourth, don’t make trouble for yourself. The school said only English is required, so if you’re a Japanese student, don’t join in the fun. Once the school discovers that you do not meet the requirements, it will directly withdraw from the school. Once you withdraw from the school, it may slip. The price is too high. Don't be a child.

Japanese is an undergraduate major in ordinary colleges and universities and is a foreign language and literature major. The Japanese major cultivates applied and research-oriented talents with a solid foundation in Japanese language and literature, a profound humanistic background, strong comprehensive Japanese skills, and the ability to skillfully use Japanese to engage in foreign affairs, cultural exchanges with Japan, education, economy and trade, science and technology, military and other fields.