Ability to generate summary using pattern match against tags and annotations

I would like to compute the time spent cumulatively on tasks within certain projects. I currently have many intervals in Timewarrior with tags based on ticket numbers from my project management software, such as `AA-aa-123`, `BB-aa-123` and `BB-bb-123`. To compute the total time spent on project BB-aa, I currently need to do something like `timew summary :year | grep 'BB-aa'` and transform the output to put into a spreadsheet where I can sum the timestamps. This is tedious and painful.

Probably this would be easier if I tagged everything like `timew start BB BB-aa BB-aa-123` and then later I could do a `timew summary BB-aa`. I don't love the idea of having redundant data in tags, which would not be necessary if I could do `timew summary BB-aa-*` or `timew summary /BB-aa-\+*/`. Note it's also difficult to retroactively change my tagging strategy as I discover problems with being able to later summarize that data since I can't easy go back and change tons of intervals to, for example, add those `BB` and `BB-aa` tags. That would require both the pattern searching I'm describing here as well as bulk modifying I described in https://github.com/GothenburgBitFactory/timewarrior/issues/338.