You can probably use the dual function for this: dual( DimensionA & ' - ' & bubblesizeexpression, bubblesizeexpression)
Edit: nevermind, just realized that the scatterplot can only show dimension values as labels, not expression values. So you need a calculated dimension. Something like =DimensionA & ' ' & aggr(sum(Something),DimensionA)
Hmm, cyclic group... = $(=getcurrentfield(MyGroup)) & ' ' & aggr(sum(Something),$(=getcurrentfield(MyGroup))
I'm assuming you meant for that to be used as the Dimension on Scatter/Bubble chart. However, I got an error message when using that expression even though the expression builder said it was OK. Furthermore, my Dimension is actually a cyclic group. If you use a simple calculated dimension (=CyclicDimension), the cyclic group does not appear on the chart. Only the first member of the cyclic group appears.