Making alpha channel gradients into multiple directions

I have a bunch of 2D mesh objects, of different transparency values, and I would really like to have the transparency kind of gradually increase and decrease from one object to another.
8377890--1104510--upload_2022-8-21_1-19-30.pngThis is what my game looks like.

Is there any easy way to do it? Or should I try to make some kind of script that would color each pixel based on its position relative to these regions? Thank you !

Sprites? What do you mean 2D mesh objects?