Details for bar chart events

**🐣 Is your feature request related to a problem? Please describe.**

When charting events, I'd like a single graph to show different keys from the same event.

**💡 Describe the solution you'd like**
I have different keys in the same event visible as a list:

When I change to chart mode:

The different keys get clumped:

I'd like 2 options for display:

- [ ] side by side bars for each key (for each day)
- [ ] stacked bars

If I dare to dream a bit, a funnel visual would also be nice (but need more config i guess)

**❓ Describe alternatives you've considered**

Just settling for the list view or separate events which take much more space in the dash:

**📋 Additional context**

This is a process that starts, continues and succeeds... so perfect for funnel style analytics.