Speaker identification in transcripts?

Quetzalcoatl  this is the kind of thing I am after. At present the standard dowload file has far too much information in it and needs to be trimmed. When using web utility tool (https://web.microsoftstream.com/VTTCleaner/CleanVTT.html) you end up with data all clumped together without time stamps and separation of speakers. The technology is there but it's the execution of formatting that needs improving. 

I've resorted to using the web tool and then pasting into word and then running some find+replace for '?' which I can then use to insert spaces. I have a saved copy of the other 'raw' transcript vtt file to reference for timings of speech as needed...