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How is 儿化 represented in other romanization systems like Wade-Giles, Zhuyin Fuhao, etc.?

I just realized that I have no idea how other romanization systems (besides pinyin) deal with 儿化 (er hua). What would be the Wade-Giles or Zhuyin-Fuhao equivalent to 电影儿 (diànyǐngr)?