Worldmap heatmap layer


I need to display quality of air on map. Best option I found was using worldmap node with heatmap layer. So far I was able to do it like shown below:

The problem is, opacity of the color scales with intensity. Blue marker should be surrounded by circle with green color, but since it's intensity is set to 0.1, it is almost invisible.
My question is: is there a way to set opacity of color(s) independently from the intensity? I tried the "minOpacity" option, but it is not working as I thought. I would be glad if anyone could help me with this. Thank you in advance.


Did you get any further with this BTW?