Since you mention UCs, you can check what it is considered for UC purposes at https://hs-articulation.ucop.edu/agcourselist . But it is very likely that colleges generally will consider it a “visual or performing arts” course rather than an English course.
Be sure that you have what is actually considered an English course if you need one to fulfill the typically-expected-by-colleges “four years of high school English”.
In terms of workload, IB courses are generally considered a lot of work.