Multiseries (grouped) BarChart variant - overlapping bars

[linden-dg]

I'm submitting a...

[ ] Regression (a behavior that used to work and stopped working in a new release)
[ ] Bug report  
[ ] Performance issue
[x] Feature request
[ ] Documentation issue or request
[ ] Other... Please describe:

Current behavior

In the current grouped BarChart, each of the bars in a group are adjacent to each other (which is what you want in almost all cases), but I'm trying to create a bar chart where the bars within a group overlap each other.

In my use case I have a primary dataset representing this year's data, which is the focus, but I also want last year's data as an underlay/overlap to be able to show the previous distribution as well.

Expected behavior

I want to reproduce something like this:

It would be nice to be able to configure the degree of overlap, but it's not 100% necessary for my use case (I can live with either partial or full).

If there's a way to do that with the current BarChart, then please let me know!

[amcdnl]

Interesting use case - I'm not entirely sure what the best way to go about this would be ( other than wrapping the Bar component in a g w/ a small offset. Let me think about it and I'll get back to you!