*Text file with speakers and timecodes is in a format that is compatible with atlas ti if you need to import the transcript there for further analyses.
Advanced options
TTML - Captions
TTML for Adobe Premiere - Captions
iTT - Captions
CSV - Captions
VTT - Captions
Pre-segmented text - Captions
Developer options
Json - Captions
Draft Js - Json
Digital Paper Edit - Json
If you need to export captions with a certain level of precision in the formatting of the lines. I'd recommend using this other app instead, subtitles composer (mac only).