as a personal reference – next time I need FinalBuilder to output data into TeamCIty (such as current build status etc..) :

here is the documentation that explains the simple text formatting rules

All you need to do in FB is to use “Comment” tasks and output the text you need based on these rules into the console.

TeamCity will pick them up automatically.

of course, this will also work with all other custom runners you might be building for TeamCity