Is there a way to add margin to the bars of a GroupBarPlot?

[j3j5]

Hi, I'm trying to create a GroupBarPlot with two BarPlots, by default the bars on each of the values of the series appear next to each other, is there a way to add a margin so there's space between them?

This is what I'm getting:

and something like this is what I'm looking to achieve:

I've been diving into the code but can't seem to find a way to do it.