Blending mode for individual letters within a word in CSS

I wonder if it is possible to apply a blending mode to individual letters to see how they overlap with negative letter spacing. As I understand it sees whole text string as one object and doesn’t apply blending for glyphs within it. Maybe there is a clever way to do this effect without dividing text to individual one letter strings?

How to get a mask from blending modes

So it’s a bit complicated but here is the gist… I made a design using blending modes with a background texture of cardboard. The idea is that the design will get printed directly on the cardboard so now I would need to basically extract those images and get them into a .PNG with transparency. But whenever I do that the white still stays left behind from not having a texture underneath it. I tried using a mixture of masking and blend but the white areas stay behind and it just looks so much worse.