Gantt readability

I’ve been playing around the new Gantt block, but what I’m building isn’t as readable as I’d like it too.

My problem is that I’d like to group by detailed categories, however:

  1. It seems I can only have a single level of grouping. To workaround this I’ve named my categories “category / sub-category / sub-sub-category”, which brings me to the next issue.
  2. It seems the header column cannot be resized, hence the category labels get truncated.

Am I missing anything and would anyone have a suggestion?
Thanks!