Heatmap bubbles: gradient delta colour (Fill = Gradient)

Calc=Volume + Fill=Dominant is almost there, but Dominant is binary — a 51/49 bubble and a 95/5 bubble are the same shade of green, and Pie at bubble size is just hard to read live (mostly half-and-half anyway). Could we get a third Fill option, Gradient: colour intensity scaled to delta ratio, saturated green/red at the extremes fading to gray when it's near-balanced? Then size still means volume and the colour finally means something — a big washed-out gray bubble reads instantly as heavy two-sided trade at a level, i.e. absorption, which is the exact thing Dominant currently paints as a clean directional print.