Gannt chart view of folder with multiple projects

I'm using a folder "lab". I've tagged tasks (from 4 different projects) into that folder. This allows me to see the demand on "lab" over time, sort of like a resource usage. It allows me to quickly check where the free slots are with that resource, so I can book in new jobs. As new projects arise, I book them into free slots.

The problem is that the tasks have no visible context so it's difficult to comprehend. You do get the project title in the list or board view but it's not available on the gantt chart.

I also use this same technique for a different view on the projects, e.g. all projects to a certain customer. But as the number of projects grows, and the number of tasks expand, inevitably there are lots of similar-sounding sub-tasks and it quickly gets out of control.

In other words, I am not looking at solely resource allocation before the resourcing add-in gets mentioned as the silver bullet.

You also have the same issue when setting this up as a calendar view as far as I can see.

Is there any way around this that I've just missed?

So a couple of ideas / thoughts

1. Add a switch to the gantt chart that allows the parent project etc. to be shown

2. Add an additional hierarchical grouping level on the gantt chart to group all shown folder tasks by parent project (my preferred approach). It would also be neat at this point to allow the user to define what goes in the roll up bar (e.g project name, custom field which I use for customer, etc.)

Thinking about it a bit, I suspect that I am thinking hierarchically but this is a database, so any task can have one or more "parents" and I'm not sure if this is even logically possible. A single task in 2 projects would then appear twice in suggestion 2 above. Suggestion 1 would still work as you could just list "Project 1" and "Project 2" beside the task.

Interested in your thoughts