If you mean adding a comment count after each thread like
[DATE] - [BLURB] (COMMENT #)
You'd have to manually input the number as part of the data (it would be another column in the spreadsheet), but it would be super easy to do! I'm not sure if you're already using it, but I can 1) format a new spreadsheet for you and you can just copy/paste your data directly onto it; 2) edit the new column and code into your existing spreadsheet if you have one; 3) guide you how to edit the spreadsheet and the code so you can edit yourself. Whichever you prefer!
no subject
[DATE] - [BLURB] (COMMENT #)
You'd have to manually input the number as part of the data (it would be another column in the spreadsheet), but it would be super easy to do! I'm not sure if you're already using it, but I can 1) format a new spreadsheet for you and you can just copy/paste your data directly onto it; 2) edit the new column and code into your existing spreadsheet if you have one; 3) guide you how to edit the spreadsheet and the code so you can edit yourself. Whichever you prefer!