BpmfIansui is a Bopomofo IVS build of Iansui: each Han character that has
more than one Bopomofo reading carries Ideographic Variation Sequences and
Private Use Area glyphs that render the character together with its
reading.

Input methods that implement the Bopomofo IVS specification, such as
chinese/fcitx5-mcbopomofo in its Bopomofo font annotation mode, use these
fonts to produce Bopomofo-annotated text for teaching material and
publishing.

Base font: https://github.com/ButTaiwan/iansui