Creating a combo chart with a breakdown by another dimension

Hello! I have created another post but I feel like the intent is more clear on this one, since it won't be so specific. I have a bar chart with a Label A, with a breakdown by a Label 2, generating several side by side bars, since I don't want them stacked. This is measuring the amount of time the events on Label A are taking on each of Label B categories. I also want to add here the amount of rows of data for each combination of Labels A and B and to do so I have tried to add a line chart over this. I have checked the possibility of creating a combo chart, but doing so removes the possibility of breaking down by Label B, leaving me with only Label A as a whole, no breakdown. Is there any possibility to implement a visualization like this? 

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Same problem, apparently it is not possible