Conditional Formatting of subitems

I would like to have conditional formatting available for subitems.
Usecase - I have a number of sub items that require a workshop / playback session. I would like to prefix the description of these with [TB] (stands for 'Touch Base) and set it so that it’s highlighted. That way - at a glance - we can see what things in the future require a meeting space / resource (including external). coordination etc. If this feature already exists, I’d like it so that I can intuitively find it.