I saved a transcript because it had lots of useful information but couldn't make sense of it so here I try mining it with a script. Click to format.
http://ward.dojo.fed.wiki/assets/pages/hangout-transcripts/format.html
We start with a list of authors. I tab separated fields to get started using Sublime's multi-select for each name then formed the working list of participants.
cat split.txt| cut -f2 | sort | uniq
David Bovill Eric Dobbs Marc Pierson Michael Mehaffy Olaf Brugman Pete Forsyth Peter Dimitrios Unknown Sender You
pages/hangout-transcripts
Open and then select the chat div.
copy($0.innerHTML)
Paste into a file named by the date.
pbpaste > 2020-12-12.html
Upload this to an asset with the format.html script.