Ok so basically

I'm using better grass on optifine and I didn't like how if it's a 2 high wall it makes it so only the default side grass texture shows to I duplicated the grass_top texture and made it the grass_side texture



I wanna make a modification in blockstates or something that makes it so:

1. If a dirt block has a grass block both on top and to the left/right of it, it displays the grass_side texture
2. all dirt blocks with a grass block above them will also show the grass_side texture

What it would look like without my pack:

That grass block between the grass blocks to the right and top would be a dirt block in reality, and the grass blocks to the right and top would have a full grass texture as the side, probably reusing the grass_side texture

I'm not sure how to do this myself as I know it would need json files, can someone help me?