Combine low opacity sprites (shadows) into one
The title is probably confusing, so I will try to explain it as well as I can.
In out game we use black sprites with low opacity as shadows. However, when multiple "shadows" stack on top of each other, they combine resulting into a darker color, which in certain cases makes everything look weird, like in the picture below.
Is there technically possible, maybe through shaders, to combine the opacity of these sprites into one, so that they don't become increasingly darker as more are stacked on top? How could I start doing that? Any resources I could read?
Thank you in advance for the suggestions!