Generally, there will be one or two teachers practicing calligraphy in schools, but practicing calligraphy does not mean that the level is good.
Moreover, there are calligraphers in the school, except those who have calligraphy classes in junior high school, but these people will not take calligraphy classes in high school because there is no calligraphy class in high school.
Most calligraphy teachers take interest classes outside. Teachers definitely choose interest classes more than teaching calligraphy at school with low salary or free of charge.