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The name is suspicious because “Jia Cheong Tan” uses two different romanization of Chinese used in different regions. “Jia” and “Tan” seems to be pinyin, which is commonly used in the mainland; yet “cheong” uses probably Wade-Giles which is used in Taiwan.
OP seems to suggest cheong is Jyuping, which is used as a romanization for cantonese, but according to wikipedia, “eong” is not a final for Jyuping. So I don’t think this is Jyuping.
disclaimer: I don’t know a lot about Jyuping or Wade-Giles, so everything I put out is from wikipedia.
See:
Yeah, they build several versions: google play version, fdroid version, and standard version (I am assuming distributed by izzydroid).
You all of them are available on github, and you can choose which one you want to get by using obtainium or download from specific app store / repos.