About Serbian transcription
Serbian (Српски / Srpski) is written in Cyrillic and Latin, both in everyday use and spoken principally in Serbia, Bosnia and Herzegovina, and Montenegro. Subtitles generated here come back in that script, as ordinary written Serbian, ready to use in an SRT or VTT file.
Serbian is written in both Cyrillic and Latin, and the two are used interchangeably in practice. Serbian, Croatian and Bosnian are close enough in speech that the choice between them is largely about which written conventions you want.

